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Mercury March 7, 2016

Pluto February 19, 2016

Comet

Comets February 19, 2016

Asteroid

Asteroids February 19, 2016

Craters and Extinctions February 19, 2016

Mars' Moons February 19, 2016

Jupiter's Moons February 19, 2016

Saturn's Moons February 19, 2016

Neptune's Triton February 19, 2016

Neptune

Neptune February 10, 2016

Uranus

Uranus February 10, 2016

Saturn's rings

Saturn February 10, 2016

Jupiter

Jupiter February 10, 2016

Mars

Mars February 10, 2016

Earth

Earth February 10, 2016

Venus

Venus February 10, 2016

Ongoing Explorations March 3, 2014

Virgo, the virgin

Virgo October 4, 2011

Aquarius

Aquarius October 4, 2011

Cancer, the Crab

Cancer, the Crab October 4, 2011

Libra, the Scales

Libra, the Scales October 4, 2011

Pisces, the fish

Pisces, the Fish October 4, 2011

Aries, the ram

Aries, the Ram October 4, 2011

Astronomical Firsts June 10, 2010

Facts and Figures June 10, 2010

Realm of the Giants June 10, 2010

Orion, the Hunter

Orion, the Hunter May 25, 2010

Gemini, the Twins

Gemini, the Twins May 25, 2010

Auriga, the Charioteer

Auriga, the Charioteer May 25, 2010

Taurus, the Bull

Taurus, the Bull May 25, 2010

Perseus, the Hero

Perseus, the Hero May 25, 2010

Cassiopeia, the Queen

Cassiopeia, the Queen May 25, 2010

Scorpius, the Scorpion

Scorpius, the Scorpion May 25, 2010

Lyra, the Harp

Lyra, the Harp May 25, 2010

Cygnus, the Swan

Cygnus, the Swan May 25, 2010

Aquila, the Eagle

Aquila, the Eagle May 25, 2010

Leo, the Lion

Leo, the Lion May 25, 2010

Boötes

Boötes, the Herdsman May 25, 2010

The universe seems to be pervaded with a previously unknown, and still unexplain

Dark Energy May 21, 2010

In galaxy cluster CL0024+1654, each yellow dot is a galaxy.

Dark Matter May 21, 2010

Tiny variations in the "afterglow" of the Big Bang are shown as different colors

Age of the Universe May 21, 2010

Cosmology

The Whole Universe May 21, 2010

Galaxies Fade May 21, 2010

Close up of Andromeda galaxy.

The Local Group May 21, 2010

The Sun and our solar system lie in the "thin disk" of our galaxy.

The Milky Way May 21, 2010

What looks like the glowing eyes of an angry cybernetic owl in this Hubble Space

Galaxy Formation May 21, 2010

Types of Galaxies May 21, 2010

An artist's concept of a giant planet orbiting a star other than the Sun.

Signs of Life May 21, 2010

Rings encircle a young planet in this artist's concept.

Exoplanets May 21, 2010

Black Holes May 21, 2010

Exploding Stars May 21, 2010

The diagram shows the largest and smallest stars to scale.

Colorful Dwarfs May 21, 2010

Sun cutaway

Star Color and Energy May 21, 2010

Cosmic Beacons May 21, 2010

Mars meteorite

Meteorites May 19, 2010

Equipment Tips May 14, 2010

What to Look For May 14, 2010

Become a Stargazer April 14, 2010

Explorations in 2009 January 7, 2009

A giant plume of hot gas explodes from the Sun's surface. Giant bubbles of hot g

Our Star, the Sun June 8, 2006

Radio Programs

Leap Day Leaping with the seasons February 29, 2016

Moon and Mars A neighbor world gets brighter February 28, 2016

Mars on Earth Getting ready for Mars February 27, 2016

Moon and Spica The end of a long journey February 26, 2016

More Plutonium Powering up trips to deep space February 25, 2016

Moon and Jupiter The might of a giant planet — after this. February 23, 2016

Moon, Regulus, and Jupiter Powering up curtains of light February 22, 2016

Moon and Regulus Marking the rhythms of the sky February 21, 2016

Pollux Mapping out a nearby star February 20, 2016

New Names New names for a family of planets February 19, 2016

To the Future! Traveling into the future February 18, 2016

Back in Time You just can’t go back February 17, 2016

Arrow of Time Going forward in time February 16, 2016

Moon and Aldebaran A stellar alphabet February 15, 2016

Planetary Pebbles Ingredients for a giant planet February 14, 2016

Horsehead Nebula Destroying a dark horsehead February 13, 2016

Interferometry V Looking at giant black holes February 12, 2016

Interferometry IV A whole passel of telescopes February 11, 2016

Interferometry III Adding up the telescopes February 10, 2016

Interferometry II Sharpening the view of the stars February 9, 2016

Interferometry Taking the measure of a giant February 8, 2016

Faint Neighbors Two close but faint neighbors February 7, 2016

Lepus Bounding past the hunter’s feet February 6, 2016

Moon and Companions Two planets without moons February 5, 2016

Moon and Venus A “liquid” atmosphere for Venus February 4, 2016

Luna 9 The first soft landing on the Moon February 3, 2016

Moon and Saturn Scoping out a giant ring February 2, 2016

The Whole Gang The worlds of the solar system February 1, 2016

Moon and Mars Breaking up a small moon January 31, 2016

Moon and Companions Stirring up two Martian moons January 30, 2016

Moon and Spica Filling a lunar “ocean” January 29, 2016

IC 1396 A busy stellar nursery January 28, 2016

Winter Milky Way Adding to the winter Milky Way January 27, 2016

Moon and Jupiter A big moon takes a beating January 26, 2016

Moon and Regulus A stellar “king” and his entourage January 25, 2016

Auriga The charioteer’s bright shoulders January 24, 2016

Procyon The revenge of the scrawny January 23, 2016

Big Dipper Clock Ticking off the hours of the night January 22, 2016

Comet Doom Debating the end of life on Earth January 21, 2016

Doomed Comets Tracking doomed comets — after this. January 20, 2016

Moon and Aldebaran Years of playing “peek-a-boo” January 19, 2016

Zapped! Zapped by the Sun — twice January 18, 2016

End of the River A river that ends twice January 17, 2016

Eridanus A footstool for the hunter January 16, 2016

Stardust Catching bits of stardust January 15, 2016

Caroline’s Cluster A surprising star cluster January 14, 2016

Aludra The showiest “dog” star of all January 13, 2016

The Dog’s Tail The big dog wags its tail — after this. January 12, 2016

Bigger and Hotter Jacking up a star’s brightness — after this. January 11, 2016

Sirius Two dogs that are moving apart — after this. January 10, 2016

Moon and Companions Building a mound on the Moon — after this. January 6, 2016

Moon and Venus Dropping in on a nasty planet January 5, 2016

Tau Ceti Visiting a dusty star system — after this. January 4, 2016

Mars and Meteors Mars, meteors, and the Moon — after this. January 3, 2016

Moon and Mars Lighting up the waning Moon — after this. January 2, 2016

New Year’s Sky A grand view for a new year December 31, 2015

Moon and Jupiter Dropping in on Jupiter December 30, 2015

Going Long Getting to the stars in a hurry December 29, 2015

Going Small Small plans for space exploration December 28, 2015

Cloudy Skies Cloudy skies across the solar system December 27, 2015

Winter Circle Circling around the winter sky December 26, 2015

Christmas Moon Lighting up the night December 25, 2015

Long-Night Moon Rudolph gets the night off December 24, 2015

Moon and Aldebaran Looking at the future of the Sun December 23, 2015

New Pluto A new view of a distant world December 22, 2015

Winter Solstice Beckoning the Sun to return December 21, 2015

El Nath Sharing a bright star December 20, 2015

Last Visit A final visit to an icy moon December 19, 2015

Switching On Switching on the heart of a galaxy December 18, 2015

Odd Relationship Black holes shut down starbirth December 17, 2015

Merging Quasars Pairs of black holes get closer December 16, 2015

Meeting in Space A meet-and-greet in space December 15, 2015

Crab Nebula A crab scuttles across the sky December 14, 2015

Breaking Down Breaking down lunar soil December 13, 2015

Geminid Meteors Dark skies for a meteor shower December 12, 2015

R Sculptoris Stirring up a stellar bubble December 11, 2015

Sculptor Looking into a galactic well December 10, 2015

More Space Astronomy Climbing above Earth’s murky air December 9, 2015

Astro-1 Astronomy from a cargo bay December 8, 2015

Space Astronomy Changing strategies in space December 7, 2015

Moon and Venus A spacecraft gets a second chance December 6, 2015

Moon and Companions Bright companions for the Moon December 5, 2015

Moon and Mars A frozen treat on the Red Planet December 4, 2015

Moon and Jupiter The master of a busy domain December 3, 2015

Orion Nebula Looking into a cradle of young stars December 2, 2015

Venus and Spica A star that’s more than meets the eye December 1, 2015

Venus and Mars Planets huddle close in the dawn sky November 1, 2015

Halloween Haunting stars in the evening sky October 31, 2015

EV Lacertae A tiny star with a big temper October 30, 2015

Moon and Aldebaran Patiently watching the bull’s eye October 29, 2015

Cassini at Enceladus Hot water on an icy moon October 26, 2015

Hunter’s Moon Marking time with the Hunter’s Moon October 25, 2015

Sheratan The hidden nature of a binary star October 24, 2015

Venus and Jupiter A great show from the “morning star” October 22, 2015

Morning Trio The first look at a hidden landscape October 21, 2015

Homunculus Nebula A giant star blows giant bubbles October 20, 2015

Eta Carinae Impressive stellar siblings October 19, 2015

Orionid Meteors Reminders of a distant comet October 18, 2015

Enif The bright nose of the winged horse October 17, 2015

Close Visitors Keeping an eye out for trouble October 16, 2015

Moon, Saturn, Antares Tracking Saturn across the sky October 15, 2015

Mars and Jupiter A close call in the morning sky October 14, 2015

Tau Ceti De-populating a popular star system October 13, 2015

Hot Planet A world you wouldn’t want to visit October 12, 2015

51 Pegasi A puffy planet gets some attention October 11, 2015

Uranus at Opposition A good showing for “George’s Star” October 10, 2015

Morning Mercury A dark planet in the dawn sky October 9, 2015

Alpha Persei A young star ages in a hurry October 8, 2015

Moon and More Companions Filling up a Martian crater October 7, 2015

Moon and Companions Bright companions for the Moon October 6, 2015

Triangulum Galaxy A busy member of the Local Group October 5, 2015

Double Cluster A pair of vigorous star clusters October 4, 2015

Faintest Cluster A faint cluster that’s doomed October 3, 2015

Rare Gems Yellow gems from the water bearer October 2, 2015

More Cosmic Background Taking the universe’s temperature October 1, 2015

Cosmic Background The crackle of the Big Bang September 30, 2015

Blue Snowball An electric-blue wake in the evening sky September 29, 2015

Mirach Stars at opposite ends of the scale September 28, 2015

Blood Harvest Super Moon Lining up names for the full Moon September 26, 2015

Lunar Eclipse Lining up a skywatching treat September 25, 2015

Weekend Goodies A great weekend for skywatching September 24, 2015

Morning Lineup Bright lights in the dawn sky September 23, 2015

Dabih A dizzying system of stars September 22, 2015

September Equinox Changing seasons — one way or another September 21, 2015

Fomalhaut Grinding up some “dusty” comets September 20, 2015

North vs. South Different views of the night sky September 19, 2015

Moon and Antares Ticking off the hours of the night September 18, 2015

Moon and Saturn Sharing space around Saturn September 17, 2015

Andromeda Galaxy Taking in all of a giant galaxy September 15, 2015

Waking Up A black hole wakes up hungry September 14, 2015

John Dobson Bringing telescopes to the masses September 13, 2015

Eagles Celestial eagles take wing September 12, 2015

Alpha Centauri Planet Taking the measure of a planet September 11, 2015

Proxima Centauri Planets Planet searches come up empty September 10, 2015

Proxima Centauri Discovering our closest neighbor September 9, 2015

Moon, Venus, and Mars Ancient Mars cools off September 8, 2015

Moon and Venus Beauty and fire in the dawn sky September 7, 2015

Zenith Looking straight up September 6, 2015

On the Move The Sun circles through the zodiac September 5, 2015

Capricornus Bright non-companions in the sea-goat September 4, 2015

Moon and Aldebaran A stellar disappearing act September 3, 2015

Luminous Red Novae One star born from two September 2, 2015

First Professor Ready for the first day of class September 1, 2015

Venus and Mars Prominent neighbors in the dawn sky August 31, 2015

Neptune at Opposition II Cranking up the winds on a distant planet August 30, 2015

Neptune at Opposition Neptune in the sky with diamonds August 29, 2015

Hunting Planets IV Patiently looking for planets August 28, 2015

Hunting Planets III Looking for big, cold planets August 27, 2015

Hunting Planets II More nights hunting for planets August 26, 2015

Hunting Planets Getting ready to hunt planets August 25, 2015

Shergotty A piece of Mars falls from the sky August 24, 2015

Messier 22 “Discovering” an ancient star cluster August 23, 2015

Gemini 5 Powering up for a trip to space August 22, 2015

Moon, Saturn, and Antares A stellar weight-loss plan August 21, 2015

Moon and Saturn Probing the heart of a giant August 20, 2015

Polaris Flare A future stellar nursery August 19, 2015

Heating Saturn Heating up Saturn’s interior August 18, 2015

Iron Rain Showering Earth with iron raindrops August 17, 2015

Cassini at Dione A final look at a two-faced moon August 16, 2015

Stellar Tourism Visiting an observatory by stagecoach August 15, 2015

Changing Addresses Venus moves to the morning sky August 14, 2015

Far, Far Away Mapping the distance to the galactic center August 13, 2015

Galactic Hub Visiting downtown Milky Way August 12, 2015

Sagittarius Steaming up the center of the galaxy August 11, 2015

More Perseids Flashes of light in the summer night August 10, 2015

Perseid Meteors Fiery skies from comet dust August 9, 2015

Moon and Betelgeuse Tracking a big, brilliant star August 8, 2015

Quick Change A star that’s changing in a hurry August 7, 2015

Moon and Aldebaran Similar but different lights near the Moon August 6, 2015

Making a Magnetar Making a powerful magnet August 5, 2015

Magnetars Powering up some strong magnets August 4, 2015

Moon and Uranus Pointing out a neglected giant August 3, 2015

Delta Cephei A surprise from a well-known star August 2, 2015

Energy Hogs Looking for signs of a super-civilization August 1, 2015

Lammas Splitting the difference on the calendar July 31, 2015

Delta Cygni Spreading out a stellar trio July 30, 2015

Blue Moon Modern folklore about the night sky July 29, 2015

More Charles Townes Shining a new light on the universe July 28, 2015

Charles Townes Dreaming up a laser beam July 27, 2015

Noctilucent Clouds Electric-blue clouds in the twilight July 26, 2015

Moon, Saturn, Antares A star of the first magnitude July 25, 2015

Moon and Saturn Following a stately planet July 24, 2015

Future Outbursts Setting up future outbursts July 23, 2015

Bread Crumbs Leaving a trail of breadcrumbs July 22, 2015

Moon and Spica Frozen in place in lunar skies July 21, 2015

Emptiness Vast “voids” between galaxies July 20, 2015

Fermi Bubbles Blowing bubbles in the Milky Way July 19, 2015

The Stinger The scorpion’s bright stinger July 18, 2015

Moon and Companions Getting ready to change addresses July 17, 2015

First Stars II Brilliant clusters in the early universe July 16, 2015

The First Stars Whipping up the first stars July 15, 2015

Stellar Metals A difference between young and old stars July 14, 2015

More Mariner 4 Changing the concept of Mars July 13, 2015

Mariner 4 Getting the first good look at Mars July 12, 2015

Stairsteps Stepping up the evening sky July 11, 2015

Moon and Aldebaran Igniting the core of a star July 10, 2015

New Horizons II Getting to know a new world July 9, 2015

New Horizons Transforming a distant world July 8, 2015

Pluto’s Moons A small world with a big moon July 7, 2015

Pluto A famous but poorly understood world July 6, 2015

Kuiper Belt “Little guys” at the edge of the solar system July 5, 2015

Earth at Aphelion Stretching out the summer July 4, 2015

Fireworks Fireworks in the evening sky July 3, 2015

Latest Sunsets Stretching the afternoon sunlight July 2, 2015

Venus and Jupiter Identifying two evening skylights July 1, 2015

Short Moon A short night of moonwatching June 30, 2015

Leap Second Stretching out the month of June June 29, 2015

Bright Trios A pair of trios in the evening sky June 28, 2015

Moon and Saturn Giant storms on a giant world June 27, 2015

Deceptive Giant A star that’s more impressive than it looks June 26, 2015

Venus and Jupiter Bright planets in the evening sky June 25, 2015

More Fred Hoyle Scientist, writer, contrarian June 24, 2015

Fred Hoyle Unlocking the secrets of the stars June 23, 2015

Martian Methane Tracking down Martian methane June 22, 2015

Methane Powering the search for life June 21, 2015

June Solstice Celebrating the June solstice June 20, 2015

Moon and Jupiter Plunging into a hidden ocean June 19, 2015

Moon and Venus Losing our eyes and ears on Venus June 18, 2015

Martian Spring Wild seasons on the Red Planet June 17, 2015

Doomed Stars Two stars with a bright future June 16, 2015

Kochab A former pole star keeps watch June 13, 2015

Thuban Lining up an ancient wonder June 12, 2015

Doomed Planets Planets with limited lifetimes June 11, 2015

Day and Night Day and night on distant planets June 10, 2015

Living in Circles The intelligent choice for planetary systems June 9, 2015

Exoplanets An astounding variety of planets June 8, 2015

Second Generation A second generation of planets June 7, 2015

Venus in the Beehive Closing in on a beehive June 6, 2015

Vega A middle-aged star with a difference June 5, 2015

Oceans Gained Filling up Earth’s oceans June 4, 2015

Ocean Lost A massive ocean on the planet Mars June 3, 2015

Gemini 4 Floating into the history books June 2, 2015

Moon and Antares Digging up some lunar history June 1, 2015

Moon and Saturn Pinpointing a giant planet May 31, 2015

Moon in Balance Bringing a constellation into balance May 30, 2015

One-Two Punch Space rocks pummel Australia May 29, 2015

Early Beacon A bright beacon in the early universe May 28, 2015

Quasars An astronomical contradiction May 27, 2015

False Alarm A hint of an interstellar radio station May 26, 2015

Omega Centauri Alien visitors from other galaxies May 25, 2015

Alpha Centauri Putting three stars on the scales May 24, 2015

Moon and Leo “Weighing” two giant stars May 23, 2015

Moon and Jupiter Jupiter loses its status May 22, 2015

Moon and Companions Bright lights in the evening sky May 21, 2015

Moon and Venus The “evening star” slows down May 20, 2015

Saturn at Opposition III Drawing rings around a giant planet May 19, 2015

Saturn at Opposition II Possible habitats on distant moons May 18, 2015

Saturn at Opposition A big show for a big planet May 17, 2015

Rising Serpent Piecing together a celestial snake May 15, 2015

Starry Spokes Circling the hub of the northern sky May 14, 2015

Hercules Cluster Stirring up a cluster of galaxies May 13, 2015

M92 An ancient family of stars May 12, 2015

M13 A cluster of old, faint stars May 11, 2015

Hercules Handing down pictures of the stars May 10, 2015

Bear’s Nose The shiny nose of the great bear May 9, 2015

North Poles Looking north from the Milky Way May 8, 2015

Dark Danger A dangerous passage through the galaxy May 7, 2015

Former Neighbor Discovering a one-time neighbor May 6, 2015

Fast Neighbor A “runaway train” in the stars May 5, 2015

Moon and Companions A giant star hides in plain sight May 4, 2015

Moon and Saturn Optical illusions in the night sky May 3, 2015

El Nath Location, location, location May 2, 2015

Rock Fight Fighting over a rock from space May 1, 2015

Moon and Spica Creeping up on a bright star April 30, 2015

Solar Nap The Sun takes a long nap April 29, 2015

Unpredictable Sun Predicting our unpredictable Sun April 28, 2015

Brighter Sun The Sun gets a lot brighter April 27, 2015

Solar Fusion The Sun shines on and on and on April 26, 2015

Evening Mercury Measuring a planetary day April 25, 2015

M87 Cluster A cosmic bullet from a black hole April 24, 2015

Hubble at 25 III A quarter-century of discoveries April 23, 2015

Hubble at 25 II The “blunder of the century” April 22, 2015

Hubble at 25 Hubble Space Telescope takes flight April 21, 2015

Moon and Venus Double “smacks” for a young planet April 20, 2015

Catching the Rain A lunar cup for catching rainfall April 19, 2015

Meteorites III Picking up some unusual rocks April 18, 2015

Meteorites II Measuring the age of the solar system April 17, 2015

Meteorites Rare treasures from beyond Earth April 16, 2015

Future Quadruplets A star cloud prepares to give birth April 15, 2015

Crackling Star Keeping an eye on a faint but busy star April 13, 2015

The Search Continues The search for planets continues April 12, 2015

Galactic Companions Like looking in a galactic mirror April 11, 2015

Local Environment Bubbles and clouds around the solar system April 10, 2015

Interstellar Clouds Looking into cloudy evening skies April 9, 2015

Interstellar Medium Filling the space between stars April 8, 2015

Moon, Saturn, and Antares Gazing at a star among stars April 7, 2015

Moon and Saturn Saturn’s ever-changing rings April 6, 2015

The Next Phase 99 days to Pluto April 5, 2015

Twin Monsters Giving life to a classic story April 4, 2015

Moon and Spica Dipping up water on the Moon April 3, 2015

Lunar Eclipse Lining up a total lunar eclipse April 2, 2015

Eclipses Through the Ages A legacy from 1492 April 1, 2015

Beryllium A key element in fact and fantasy March 31, 2015

Denebola The “dusty” tail of the lion March 30, 2015

Moon and Regulus The intertwined lives of two stars March 29, 2015

Moon and Jupiter Dipping into a giant hot tub March 28, 2015

Moon in the Middle Passing through a bright triangle March 27, 2015

African Astronomy III Blue flashes from the distant universe March 26, 2015

African Astronomy II New uses for old radio dishes March 25, 2015

African Astronomy Changing views of southern skies March 24, 2015

Spring Storm Making a mess of Easter Sunday March 23, 2015

Alphard A long but barren constellation March 22, 2015

Moon and Venus Shaking up the solar system March 21, 2015

Moon and Mars Warming up a cold planet March 20, 2015

Spring Equinox Springing into a long, long day March 19, 2015

Solar Eclipse Extra darkness for the Arctic March 18, 2015

Small Steps Small steps in the exploration of space March 17, 2015

M3 Reinvigorating some old stars March 16, 2015

The Hunting Dogs A pair of hunting dogs without much bite March 15, 2015

MY Camelopardalis A brilliant duet for the giraffe March 14, 2015

Moon, Saturn, and Antares Heating up the Moon’s interior March 11, 2015

Moon and Saturn Swimming through a “death star” March 10, 2015

Pandora’s Cluster Mapping a galactic pile-up March 9, 2015

On the Frontier Pushing the intergalactic frontier March 8, 2015

Moon and Spica Safety first around an amazing star March 7, 2015

Arcturus Measuring the girth of a big star March 6, 2015

More Dawn at Ceres Looking for water on an asteroid March 4, 2015

Dawn at Ceres A spacecraft makes a second port of call March 3, 2015

Moon and Regulus A royal heart for a royal beast March 2, 2015

Moon and Jupiter Adding color to a giant planet March 1, 2015

Seeing the Past Looking at the solar system’s past February 28, 2015

Beta Cassiopeia Watching a star puff up February 27, 2015

Hints of Life Hints of life in more Mars rocks February 26, 2015

Fewer New Stars A decline in the stellar birth rate February 25, 2015

Moon and Aldebaran The cool glow of a bright star February 24, 2015

Canopus III Navigating by a bright star February 23, 2015

Canopus II Pinning down a giant star February 22, 2015

Canopus Sailing across southern skies February 21, 2015

Double Double A double double in the evening sky February 20, 2015

Triple Play II Two very different neighbors February 19, 2015

Triple Play A triple play in the evening sky February 18, 2015

Winter Milky Way Looking toward the galaxy’s outskirts February 16, 2015

Spiral Galaxies Pinwheels and whirlpools February 15, 2015

Cancer Grabbing a toe was a bad idea February 14, 2015

Solar Max Taking a look at the busy Sun February 13, 2015

Bright Paw The big dog’s brilliant paw February 12, 2015

Morning Moon A bright future for the scorpion February 11, 2015

Bright Merger The fireworks of a hostile takeover February 10, 2015

Beta Monocerotis A brilliant set of triplets February 9, 2015

Moon and Spica A touch of fall near the Moon February 7, 2015

Seeing Red Seeing red from a dying star February 6, 2015

Jupiter at Opposition A big showing for a big planet February 5, 2015

Iron Ironing out a heavy element February 4, 2015

Moon and Regulus Settling the dust on the Moon February 3, 2015

More Moon and Jupiter The Moon stays active February 2, 2015

Moon and Jupiter “Warping” the heart of a planet February 1, 2015

Brackets Bright lights bracket the evening sky January 31, 2015

Celestial Equator Splitting the night sky in half January 30, 2015

Winter Circle A brilliant ring around the Moon January 29, 2015

Meteor Plots On the trail of “shooting stars” January 28, 2015

Catching Neutrinos Tiny particles that change flavors January 27, 2015

Cold Dark Matter Getting cold to catch dark matter January 26, 2015

Soudan Laboratory Digging deep for dark matter January 25, 2015

Perseus Taking the measure of a monster January 24, 2015

Procyon One dog leads another across the sky January 23, 2015

Occultations Illumination from darkness January 22, 2015

Moon and Mars Asteroids take aim at Mars January 21, 2015

Moon and Venus Venus’s nightside goes green January 20, 2015

Binary Planets Two planets for the price of one January 19, 2015

Filling the Void Filling the intergalactic void January 18, 2015

Orion’s Head Heading for the top of the hunter January 17, 2015

Trapezium Lighting up a galactic trapeze January 16, 2015

Moon and Companions A brilliant presence in the night sky January 15, 2015

Moon and Saturn Filling up a giant gas station January 14, 2015

Huygens Parachuting through alien skies January 13, 2015

Close Escape A black hole snacks on a star January 12, 2015

Survivor The heart of the galaxy stays quiet January 11, 2015

Johannes Hartmann Filling the space between the stars January 10, 2015

Venus and Mercury Pointing the way to a little planet January 9, 2015

First Glimpse Ready for a first look at Pluto January 8, 2015

Icy Time Capsules Refugees from the realm of the giants January 7, 2015

Moon and Jupiter Closing in on two dwarf planets January 6, 2015

Eris Reflections on a bright dwarf planet January 5, 2015

Dwarf Planets A new name for leftover building blocks January 4, 2015

Sirius Rising The Dog Star climbs into winter evenings January 3, 2015

Close to the Sun Snuggling close to the Sun January 2, 2015

Quadrantid Meteors The changing landscape of the sky January 1, 2015

Moon and Aldebaran A game of cat and mouse in the night sky December 31, 2014

Featured Images

Planetary nebula known as the Eskimo Nebula

Cyclops? November 29, 2015

Hubble view of galaxy Markarian 231

Double Double November 22, 2015

Radio view of asteroid 2015 TB145, which will pass close to Earth on Halloween

Boo! October 31, 2015

Hubble view of the Eta Carinae system

The Homunculus October 21, 2015

Cassini view of north polar region of Enceladus

Headin' North October 15, 2015

Global view of Charon, Pluto's largest moon

Red Roof Moon October 2, 2015

Total lunar eclipse, October 2014

Lunar Eclipse September 26, 2015

Backlit view of Pluto landscape from New Horizons

Hazy Skies September 22, 2015

Comet ISON has disintegrated

Comet Fizzles? September 14, 2015

Comet ISON streaks ever-closer to the Sun in this November 19 image

Breaking Up? September 14, 2015

Comet Crawl September 14, 2015

Artist's concept of a young Jupiter-like planet

Young Giant August 27, 2015

Two views of Messier 22

Stellar Sparkler August 24, 2015

August 17, 2015, view of Saturn's moon Dione in front of the giant planet

Last Visit August 18, 2015

Multi-wavelength view of the center of the Milky Way galaxy

Galactic Hub August 13, 2015

The Southern Owl Nebula, the last gasp of a dying star

Perfect Bubble August 5, 2015

Hubble Space Telescope image of the Lagoon Nebula

Colorful Lagoon July 31, 2015

Abell 78, a planetary nebula

Last Round July 28, 2015

The system V664 Cassiopeia is creating a planetary nebula

Bread Crumbs July 23, 2015

Artist's concept of Fermi bubbles

Blowing Bubbles July 20, 2015

New Horizons view of young mountains on Pluto

Ice Mountains July 15, 2015

First Eyes on Mars July 13, 2015

July 12 views of Charon and Pluto from New Horizons

Hours Away July 13, 2015

July 8 view of Charon, Pluto from New Horizons

Dynamic Duo July 10, 2015

Artist's concept of New Horizons passing by Pluto

First Encounter July 9, 2015

New Horizons view of Pluto and Charon, July 1, 2015

Best Shot July 7, 2015

Diagram shows the location of the Kuiper Belt

Icy Realm July 6, 2015

Encounter between Venus and Jupiter, July 2015

Planetary Headlights July 2, 2015

Cassini view of a giant storm in Saturn's northern hemisphere

Stormy Skies June 28, 2015

Views of the Venus-Jupiter evening encounter, June 26-July 4, 2015

Brilliant Encounter June 26, 2015

A mosaic of spacecraft images shows the varied surface of Ganymede

Hiding an Ocean June 20, 2015

Two views of Saturn's moon Dione from Cassini

Near and Far June 18, 2015

Artist's concept of a moons orbiting a Jupiter-like exoplanet

Worlds of Worlds June 9, 2015

Stepping Out June 3, 2015

Artist's concept of Alpha Centauri A and B, plus a planet

Busy Neighbor May 25, 2015

The western evening sky of May 22, 2015

Crowded Skies May 22, 2015

Ringfest May 20, 2015

The constellation Corvus, near brilliant Spica

Sailing On May 17, 2015

Sunset at Gale Crater, Mars, April 2015

Blue Skies May 14, 2015

Hubble Space Telescope view of the core of M13, a globular cluster in Hercules

Old Sparklers May 12, 2015

Artist's concept of Scholz's Star passing close to the solar system

Former Neighbor May 7, 2015

The Messenger spacecraft's final image of the surface of Mercury

The End April 30, 2015

Artist's concept of Earth's distant future

Bright Future April 29, 2015

Hubble Space Telescope image of a young star cluster

Anniversary Portrait April 23, 2015

Dawn images of north pole of Ceres

Over the Top April 17, 2015

Hubble Space Telescope image of spiral galaxy Messier 66

Evidence of an Encounter April 12, 2015

Infrared view of the interstellar medium

Filling the Void April 9, 2015

Cassini view of Saturn's family of gings

Family Portrait April 7, 2015

Rosetta view of Comet Churyumov-Gerasimenko on March 22, 2015

Messy Comet April 2, 2015

View of Loki Patera, a lake of molten rock on Io, a moon of Jupiter

Hot Lake March 29, 2015

G2 survives its swing around the black hole at the center of the Milky Way

Narrow Escape March 27, 2015

Space-based view of solar eclipse of March 20, 2015

Disappearing Sun March 20, 2015

M3, a globular star cluster

Reborn Stars March 17, 2015

Artist's concept of MY Camelopardalis, a contact binary star system

Close Twins March 15, 2015

Image of a powerful solar flare on March 11, 2015

Solar Flare March 12, 2015

Hubble Space Telescope view of Abell 2744, a massive galaxy cluster

On the Frontier March 9, 2015

A full rotation of Ceres as seen by the Dawn mission

Final Approach March 3, 2015

Dawn image of mysterious bright spots on Ceres, February 19, 2015

Bright Mysteries February 26, 2015

Canopus, the second-brightest star in the night sky, from the space station

Stellar Beacon February 24, 2015

The Milky Way galaxy's spiral arms

Arming the Milky Way February 18, 2015

Artist's concept of Solar Max in orbit

Sun Watcher February 14, 2015

Hubble Space Telescope view of V838 Monocerotis in 2006

Brilliant Echo February 11, 2015

Cassini view of Jupiter from 6 million miles

Turbulent Giant February 6, 2015

Depiction of National Ignition Facility probing the interior of a giant planet

Into Darkness February 2, 2015

Hubble image of the aftermath of a galactic collisio

Beautiful Disruption January 30, 2015

Dawn image of Ceres, January 25, 2015

Getting Closer January 28, 2015

View of the underground Soudan Laboratory

Underground Astronomy January 26, 2015

A brilliant aurora from the International Space Station

Fiery Sky January 21, 2015

The Huygens probe arrives at Titan in 2005

Cold Landing January 14, 2015

Gemini Observatory image of VV 166 galaxy group

Galaxies Galore January 11, 2015

Three dwarf planets shown to scale with Earth and Moon

Dwarf Planets January 5, 2015

Lunar Giant December 30, 2014

Composite image of the Sun

Hot Sun December 24, 2014

Rigel, the brightest star of Orion

Stellar Stunner December 22, 2014

The Andromeda galaxy, M31

Old News December 20, 2014

Cassini close-up of Saturn's clouds

Impressions of a Planet December 18, 2014

Earliest sunsets in December

Early Sunsets December 15, 2014

Possible origin of the Ocean of Storms

Cracks in the Moon December 11, 2014

Curiosity rover view of rock layers inside Gale Crater on Mars

Ancient Lakebed December 9, 2014

Superflare on one of the stars of DG Canum Venaticorum

Tiny Star, Big Outburst December 3, 2014

Hubble Space Telescope view of Tadpole Galaxy

Galactic Tadpole November 27, 2014

Artist's concept of Epsilon Aurigae

Playing Frisbee November 23, 2014

Double Dribble November 20, 2014

COBE view of the cosmic microwave background

Afterglow November 18, 2014

Sunlight glints off a hydrocarbon lake on Titan, the largest moon of Saturn

World of Lakes November 11, 2014

Cassini view of a crescent Titan, largest moon of Saturn

Hazy Skies November 9, 2014

View of a newly forming planetary system around the young star HL Tauri

Planet Tracks November 6, 2014

Messenger view of the surface of Mercury

Getting Closer October 30, 2014

Postcard of the historic Elgin Watch Company Observatory in Illinois

Star Time October 25, 2014

Artist's concept of Comet Siding Spring approaching Mars

Martian Encounter October 16, 2014

Jupiter's radiation belts

Jovian Shields October 15, 2014

October 7 view of Rosetta spacecraft and its target comet

Neighbors October 14, 2014

Elephant Trunk Nebulan

Elephant's Trunk October 12, 2014

Hubble Space Telescope view of Uranus

Tilted Giant October 6, 2014

Fomalhaut in early October

Lonely Star October 1, 2014

Possible image of a moon being born in Saturn's rings

New Moon Rising? September 27, 2014

India's Mars Orbiter Mission

On Target Again September 24, 2014

Artist's concept of MAVEN orbiting MARS

On Target September 20, 2014

Through the Glow September 16, 2014

Hubble image of star cluster M15

Old Family September 11, 2014

September 9, 2014, view of Curiosity rover's surroundings on Mars

Going Strong September 9, 2014

The Moon occults Dabih, a star in Capricornus

Celestial Cover-Up September 5, 2014

View of Saturn's rings from Cassini

Clearing the Gaps August 31, 2014

Cat's Eye Nebula from Hubble Space Telescope

Colorful Demise August 29, 2014

NGC 1398, a spiral galaxy in the constellation Fornax

Strangely Familiar August 23, 2014

Voyager 1 view of Jupiter's Great Red Spot

Long-Lasting Storm August 18, 2014

Hubble Space Telescope view of Jupiter, Ganymede

Layer-Cake Moon August 15, 2014

Jetting Across the Universe August 12, 2014

August 6, 2014, view of Comet Churyumov-Gerasimenko by Rosetta

Getting Closer August 7, 2014

August 3, 2014, image of Comet Churyumov-Gerasimenko from Rosetta

Arrival August 6, 2014

Giant impact craters on Saturn's moons Mimas and Tethys

Survivors August 4, 2014

Ranger 7 images of the Moon, July 31, 1964

Success at Last July 31, 2014

Artist's concept of hot gas funneling toward black hole at center of Milky Way

Dark Center July 29, 2014

A view of the busy Milky Way

Busy Galaxy July 24, 2014

Diagram comparing sizes of Sun, Aldebaran

Giant Eye July 21, 2014

Artist's concept of comet impact on Jupiter

Strike One! July 16, 2014

Magellanic clouds above the ALMA radio telescope array

Cloudy Neighbors July 14, 2014

False-color image of M27, the Dumbbell Nebula

Last Gasp July 12, 2014

Artist's concept of Solar Orbiter

Feeling the Heat July 4, 2014

Europa orbiter mission concept

Fresh Idea July 3, 2014

Fading Away June 29, 2014

Infrared view of Serpens South star cluster and nebula

Unmasking Hidden Stars June 24, 2014

Hubble Space Telescope view of Eta Carinae

Future Fireworks June 16, 2014

Three solar flares in early June 2014

Solar Fireworks June 12, 2014

Cassini spacecraft passes Titan

A Decade at Saturn June 10, 2014

Combined visible, X-ray image of M51, the whirlpool galaxy

Colorful Whirlpool June 4, 2014

M44, the Beehive Cluster

Vanishing Beehive June 2, 2014

Venus, Mercury, and the earthshine-illuminated crescent Moon

Lighting the Shadows May 30, 2014

NGC 3590

Young and Future Stars May 22, 2014

Hubble views of Jupiter's Great Red Spot

Shrinking Storm May 15, 2014

Simulation of the early universe

Tangled Web May 10, 2014

Otto Struve, first director of McDonald Observatory

First Director May 8, 2014

Autographs from the dedication of McDonald Observatory

Who's Who May 7, 2014

Construction of McDonald Observatory's 82-inch telescope, ca. 1934

Celebrating May 6, 2014

Participants in the McDonald Observatory dedication, May 5, 1939

Getting Started May 5, 2014

Artist's concept of water vapor around Ceres; HST image of Ceres

Watery Dwarf May 2, 2014

Diagram showing the layouts of several exoplanet systems

Going Farther April 30, 2014

Artist's concept of a range of recently discovered exoplanets

Planet Hunting April 28, 2014

Views from the 1964 World's Fair

Space Fair April 22, 2014

HST image of thousands of galaxies

Galaxies Galore April 17, 2014

Cassini image of a possible satellite growing in the outer regions of Saturn's r

Giving Birth? April 15, 2014

Black-widow pulsar

Doomed Mate April 10, 2014

Artist's concept of early morning fog, clouds, and frost on Mars

Morning Fog April 8, 2014

Artist's concept of a solar sail

Sailing Along April 3, 2014

WISE view of the Vela Nebula in Cygnus

Glowing Civilizations? April 1, 2014

Mariner 10 at Mercury

First Encounter March 29, 2014

Venus Express movie showing south polar vortex

Double Vortex March 27, 2014

The Milky Way glows above the Nevada desert

Dig Site March 24, 2014

Lunar Reconnaissance Orbiter view on lunar north polar regions

Top o' the Moon March 19, 2014

The Condor galaxy

Night of the Condor March 15, 2014

A rare yellow hypergiant star in Centaurus

Jolly Yellow Giant March 13, 2014

Artist's concept of a double sunset on exoplanet Kepler 16

Double Sunset March 5, 2014

Artist's concept of exoplanet system KOI-961, discovered by Kepler spacecraft

Worlds Galore March 3, 2014

Space-based infrared view of the Rosette Nebula

Ruffled Rose February 28, 2014

NGC 2264, a stellar nursery in Monoceros

Star Factory February 26, 2014

Downhill Racer February 22, 2014

Diagram of Orion, the hunter

Orion's Belt February 16, 2014

Fresh Martian impact crater seen by an orbiting spacecraft in late 2013

Fresh Impact February 7, 2014

A discharge of energy from the Z Machine at Sandia National Laboratories

Zapped! February 3, 2014

Peek-a-Boo January 31, 2014

Close-up view of the California Nebula in infrared light.

California Nebula January 25, 2014

Close-up Hubble Space Telescope view of the Orion Nebula

Beautiful Birthplace January 23, 2014

Artist's concept of Rosetta contacting Earth

Back to Work January 20, 2014

Artist's concept of black hole binary star system in the galaxy M101

Brilliant Darkness January 16, 2014

Hubble Space Telescope view of M83 galaxy

Glowing Pinwheel January 10, 2014

Artist's concept of weather on a brown dwarf

Hot Rain January 8, 2014

A giant asteroid slams into Earth, leading to global extinctions

Impact! January 6, 2014

Artist's concept of a Mars Exploration Rover landing on Mars in 2004

Follow the Bouncing Rover January 4, 2014

An early view of the primary mirror of McDonald Observatory's first telescope

Seeing the Light December 31, 2013

Three views of Comet Kohoutek

Comet Flop December 26, 2013

Gold may have been created in the mergers of neutron stars

Golden Mergers December 23, 2013

RS Puppis, a supergiant star seen by Hubble Space Telescope

Dusty Skies December 18, 2013

Superman's back story may have been inspired by an exploding star

Exploding Stars December 14, 2013

China's Yutu rover on the Moon in an artist's concept

Lunar Returns December 14, 2013

Annie Jump Cannon

Astronomical Pioneer December 10, 2013

Female "computers" at Harvard College Observatory

Data Processing Center December 9, 2013

Space station view of Comet ISON and other celestial objects

Doomed Comet December 4, 2013

A Cassini view of the hexagonal cloud pattern surround Saturn's south pole

Planetary Cyclops December 1, 2013

View of Comets ISON and Encke from a Sun-watching spacecraft

Sizzling Comets November 27, 2013

Almost Ready November 18, 2013

Launch of MAVEN spacecraft to Mars

On Its Way November 18, 2013

Artist's concept of MAVEN Mars orbiter

Mars Maven November 17, 2013

The life and times of William Herschel

Stellar Musician November 14, 2013

Telescopes at the south pole

Antarctic Adventures November 13, 2013

Telescopic view of M33, the Triangulum Galaxy

Pirouetting Octopus November 10, 2013

Technicians replace equipment for HETDEX at McDonald Observatory

On (and Off) Track November 4, 2013

Artist's concept of extrasolar planet Kepler 78b, an Earth-sized world

Hot Rock October 31, 2013

The Planck space telescope and its view of the cosmic microwave background

Going Dark October 24, 2013

Hubble Space Telescope view of Comet ISON in October 2013

Getting Closer October 18, 2013

Hubble Space Telescope images of the Fomalhaut star system

Giant Planet of Mystery October 15, 2013

Rio Tinto, a river in Spain, is a Mars analog

Red River October 9, 2013

Magellan view of the giant Sapas Mons volcano on Venus

Venusian Vulcanism October 7, 2013

Hubble Space Telescope view of planet Uranus

Blue-Green Giant October 1, 2013

The Cat's Paw Nebula in submillimeter and near-infrared light

Star Maker September 27, 2013

Dumbbell Nebula, M27

Grand Finale September 24, 2013

Galileo enters Jupiter's atmosphere

Fiery Farewell September 21, 2013

Lightning behind space shuttle Discovery

Just Whistle September 19, 2013

The Great Square of Pegasus

Double Duty September 12, 2013

LADEE launch, September 6, 2013

Moon Bound September 7, 2013

Composite Galileo image of Jupiter's volcanic moon Io

Jovian Adventure August 30, 2013

Artist's concept of Spitzer Space Telescope

Heat Seeker August 23, 2013

Saturnian Heat Rays August 21, 2013

The star Gamma Cas blows away gas from a nearby nebula

Star Blaster August 18, 2013

Artist's concept of planet HAT-P7b

Hot Spot August 16, 2013

Cassini view of the cracked crust of Saturn's moon Dione

Cracked Up August 12, 2013

Hubble image of a galaxy cluster and the deduced location of its dark matter

Dark Universe August 5, 2013

Eastern dawn sky, early August 2013

Morning Jam August 2, 2013

One of the first images from IRIS, a new Sun-watching satellite

First Sunlight July 31, 2013

Space-faring spider Arabella spins her first web in orbit, 1973

Spiders in Space July 29, 2013

Diagram shows Neptune and some of its moons, including one discovered in 2013

Second-Look Moon July 22, 2013

Cassini monitors Saturn's magnetic field

Radio Story July 16, 2013

Artist's concept of a blue exoplanet

Blue-Hot Planet July 13, 2013

View of the 30 Doradus star cluster and the massive binary system R144

Megastars July 9, 2013

Hubble Space Telescope view of Comet ISON, May 2013

Closing In July 2, 2013

Ultraviolet view of spiral galaxy NGC 6744 from the GALEX spacecraft

End of the Line June 29, 2013

The Standard Model

Building Blocks June 27, 2013

Alpha Magnetic Spectrometer aboard the International Space Station

Magnetic Personality June 26, 2013

Sunset from the International Space Station

Eyes on High June 24, 2013

Clouds above the south pole of Titan

Titanic Vortex June 19, 2013

MESSENGER view of crater Degas on Mercury

Painting a Planet June 17, 2013

Dusty Vega system

Dust Trap June 14, 2013

Kasei Valles, an ancient flood channel on Mars

Ancient Flood June 10, 2013

Starbirth region on the edge of the Milky Way galaxy

Starbirth June 6, 2013

Images of solar telescopes around the world

Fanciful Eyes June 3, 2013

Hubble Space Telescope image of M101

Stellar Pinwheel May 31, 2013

Planetary conjunction, May 2013

Evening Traffic Jam May 25, 2013

Ligeia Mare, one of the largest lakes on Titan, the largest moon of Saturn

Storms Ahead? May 22, 2013

Combined visual and millimeter-wave view of Orion Nebula, M42

Cold Fire May 16, 2013

Skylab in orbit

First Space Station May 14, 2013

Hubble Space Telescope, May 2009

Recalibrating May 6, 2013

Cassini view of Saturn's north pole

Eye of the Storm May 2, 2013

Pyramid of the Old Kingdom pharaoh Khafre and the Sphinx

Inside Job April 30, 2013

Hubble Space Telescope image of Comet ISON, April 2013

Closing In April 24, 2013

Artist's depiction of planet orbiting Alpha Centauri B

Close Neighbor April 21, 2013

Hubble view of Coma Cluster of galaxies

Crowning Glory April 19, 2013

The Antennae galaxies

Getting Together April 16, 2013

GRAIL map of lunar surface gravity

Lunar Lumpiness April 14, 2013

Infrared view of Betelgeuse

Messy Star April 12, 2013

Supercomputer simulations of Earth's magnetic field

Twist and Flip April 8, 2013

Lunar Orbiter view of Aristarchus crater

Bright Crater March 28, 2013

X-ray view of a gamma-ray burst

Zapping Earth March 26, 2013

Artist's concept of a neutron star's crust cracking

Cracking Up March 22, 2013

Curiosity rover view of Mount Sharp, March 2013

Sharp Destination March 19, 2013

Comet C/2011 L4 Panstarrs in the western evening sky in March

Sneaky Comet March 10, 2013

Cassini views Saturn's magnetic field

Solar Sculptor March 1, 2013

A black hole is created in the Large Hadron Collider, then quickly evaporates

Making a Black Hole February 26, 2013

Self-portrait of Curiosity rover on Mars, February 2013

Self-Portrait February 18, 2013

Keeping Track February 16, 2013

Chart showing the path of asteroid 2012 DA14 relative to Earth.

Getting Close February 14, 2013

Artist's concept of the Milky Way galaxy and its dark matter halo

Illuminating the Darkness February 9, 2013

Artist's concept of a distant quasar

Fiery Galaxy February 5, 2013

The starry ceiling of Grand Central Terminal

Grand Sky February 2, 2013

Close-up of the core of M31

M31 Blues January 29, 2013

Visible- and infrared-light views of Orion

Double Vision January 25, 2013

Star forming region in Orion

Hiding Places January 23, 2013

High-resolution view of Phobos, moon of Mars

Doomed Moon January 13, 2013

Gemini Observatory view of outskirts of Orion Nebula

Knotheads January 10, 2013

Combined optical and X-ray view of two possible black holes in the galaxy IC 342

On the Job January 8, 2013

Hubble Space Telescope view of globular cluster M2

Stars Galore January 6, 2013

Comet McNaught, 2007

Bright Interlopers January 2, 2013

Soyuz spacecraft approaches space station with Moon in background

Ready for Arrival December 31, 2012

Cassini images of Dione, Rhea

Saturnian Two-Fer December 27, 2012

Van Allen Probes and Earth's Van Allen radiation belts

Dangerous Exposure December 20, 2012

Artist's concept of the Sun's structure

Powerhouse December 17, 2012

Gravitational map of the Moon compiled by the GRAIL mission

Lunar Attraction December 15, 2012

Artist's concept of Mariner 2 flying past Venus, December 14, 1962

First Encounter December 13, 2012

Apollo 17 astronaut Gene Cernan drives his lunar rover

End of the Road December 10, 2012

Hubble image of an edge-on galaxy, ESO 318-13

All that Glitters December 4, 2012

Curiosity view of Rocknest on Mars

Rocky Home November 29, 2012

Orion, Jupiter, and other sights in late November

Orion Rising November 26, 2012

Cassini view of a crescent Titan

Enigmatic Moon November 19, 2012

Multispectral view of giant star-forming regions at the center of the Milky Way

Molecule Factory November 13, 2012

South polar vortex on Saturn, seen by Cassini

Saturnian Vortex November 11, 2012

HESS telescopes in Namibia, which study the gamma-ray universe

Extreme Telescope November 8, 2012

Nighttime view of the southeastern U.S. from the International Space Station

Blue Night November 5, 2012

Voyager 1 view of Jupiter's cloudsk

Artistic Clouds November 1, 2012

Infrared/ultraviolet view of Helix Nebula

Colorful Demise October 23, 2012

Orionid Meteor Shower

Orionid Meteors October 20, 2012

Cassini view of Saturn, October 2012

Saturn Looms Large October 18, 2012

Planetary nebula R Leporis

Stellar Twister October 11, 2012

The nearby starburst galaxy IC 10

Active Neighbor October 8, 2012

The 'lucky' stars of Aquarius

'Lucky' Stars October 6, 2012

Moon, Jupiter, and Taurus, October 4-5, 2012

Bull Rush October 4, 2012

Venus-Regulus encounter in the pre-dawn sky, October 2-4, 2012

Morning Mashup October 1, 2012

Recent image from Mars rovers Curiosity and Opportunity

Mars Targets September 29, 2012

Portion of Hubble Extreme Deep Field

Extreme Astronomy September 25, 2012

First-quarter Moon

Moonwatch September 22, 2012

Infrared image of the star Fomalhaut (center) and surround debris ring

Messy Building Zone September 18, 2012

Andromeda and the Milky Way head for a galactic pile-up

Collision Course September 12, 2012

Hubble image of a pair of galaxies

Bright Companions September 7, 2012

Artist's concept of the Gamma Cephei star system

Stellar Geometry September 4, 2012

About one hour after sunset, late August and early September

Red Rivals August 29, 2012

Neil Armstrong aboard the lunar module Eagle, July 21, 1969

Leading the Way August 26, 2012

View of the asteroid Vesta from the Dawn spacecraft

Ready for Departure August 23, 2012

A Voyager spacecraft and the cover of a record of Earth sights and sounds

Words From Home August 20, 2012

Solar eclipse of August 19, 1887, from near Berlin

Fire in the Sky August 18, 2012

Illustration depicts the contact binary system W Ursae Majoris

Two-for-One Offer August 15, 2012

Early view of the rim of Gale Crater

Inside the Wall August 12, 2012

Mars Science Laboratory heatshield falls away

Martian Litter August 10, 2012

August 8, 2012, view of Mars from the Curiosity rover

Getting Acquainted August 8, 2012

Composite view of Curiosity rover landing and operating on Mars

Drop In, Stay Awhile August 6, 2012

Skycrane lowers Mars Science Laboratory to the Martian surface

Rube Goldberg Meets Mars August 5, 2012

Artist's concept of Mars Science Laboratory approaching the Red Planet

Final Approach August 3, 2012

The Lagoon Nebula, M8, from the European Southern Observatory

Pink Lagoon July 26, 2012

Current and future pole stars

Moving On July 23, 2012

Alexandria, Egypt, as seen from the International Space Station

City of Power July 20, 2012

False-color view of Comet Swift-Tuttle, 1992

Swift Comet July 16, 2012

Altair is one of the three planets of the Summer Triangle

Flying Eagle July 12, 2012

H-R Diagram

Stellar Plot July 7, 2012

Hubble Space Telescope view of M104, the Sombrero Galaxy

Galactic Hat Dance July 2, 2012

A flare on the surface of the star HD 189733 blasts away the atmosphere of an or

Zapped! June 29, 2012

Moon and Companions, June 2012

Moon and Company June 25, 2012

The remnants of two merged galaxies

Fast Exit June 18, 2012

Apollo 17 at the rim of Shorty Crater, December 1972

Back to the Moon(rocks) June 11, 2012

June 5, 2012, Venus transit from International Space Station

Seeing Spots June 9, 2012

Infrared image of the Carina Nebula from space-based Herschel Observatory

Busy Nursery June 6, 2012

Diagram of Venus transit of June 5, 2012

Sun Spot June 4, 2012

Partial lunar eclipse of June 4, 2012

Lunar Nibble June 2, 2012

Hubble Space Telescope view of galaxy ESO 243-49

Little Giant May 29, 2012

Hercules, the strongman, depicted as he rises in the eastern sky

The Strongman May 22, 2012

Illustration of annular eclipse of May 20, 2012

In the Zone May 18, 2012

Star Stream May 15, 2012

Saturn's moon Titan floats in front of the giant planet

Moon on a String May 11, 2012

Without Einstein's theories of relativity, GPS wouldn't work

Where Am I? May 8, 2012

Simulation of a supermassive black hole disrupting a star

Messy Meal May 4, 2012

Beams of light shine through the Egg Nebula

Stellar Headlights May 1, 2012

Combined X-ray, optical, and radio view of the galaxy Centaurus A

Busy Galaxy April 29, 2012

Two views of Saturn's outermost ring

Wiggly Ring April 26, 2012

An ultraviolet camera gazes skyward from the Moon during the Apollo 16 mission

Looking Up April 23, 2012

Apollo 16 lunar module, Orion, on the Moon's Plains of Descartes

Almost Home April 21, 2012

Space shuttle Discovery flies above Washington, DC, April 17, 2012

Last Stop April 19, 2012

Saturn's battered moon Tethys seen by the Cassini Spacecraft, April 14, 2012

Wrinkly Moon April 17, 2012

Saturn and its rings as seen by Cassini

Subtle Color April 15, 2012

Victor Hess prepares to ascend in a balloon to study cosmic rays, 1912

Radiation Hunter April 7, 2012

Artist's concept of the Kepler-35 system, with a giant planet orbiting two stars

Seeing Double April 4, 2012

Artist's concept of stars and a gas cloud near the Milky Way's central black hol

Snack Time March 29, 2012

Water geysers from the south pole of Enceladus, a moon of Saturn

Leaking Moon March 26, 2012

Omega Centauri, the possible core of a defunct galaxy

Invader! March 23, 2012

Space-based infrared view of the Large Magellanic Cloud

Busy Neighbor March 20, 2012

Optical and X-ray image of the galaxy cluster Abell 383

Brilliant Darkness March 16, 2012

Hubble Space Telescope view of Cat's Eye Nebula, a planetary nebula

Blowing Bubbles March 13, 2012

Venus and Jupiter pass each other in the evening sky, March 10-14, 2012

Celestial Headlights March 10, 2012

A powerful solar flare erupts on March 6, 2012

Stormy Skies March 8, 2012

The Moon passes by Mars and the star pattern of Leo, March 2012

Doubly Brilliant March 6, 2012

Mars is at opposition in early March 2012, shining brightest for the year

Mighty Mars March 3, 2012

Newborn stars in the Orion Nebula

Bright Babies March 1, 2012

Voyager mission enhanced-color image of Jupiter's Great Red Spot

Planetary Impressionism February 26, 2012

John Glenn enters his Mercury capsule (right), and launches on February 20, 1962

Up, Up, and Away! February 20, 2012

Orion, the hunter, including his faint shield

Shielding the Hunter February 17, 2012

The Carina Nebula, a massive stellar nursery

Star Factory February 13, 2012

Dark lunar features are named seas or oceans

Split Personality February 9, 2012

New Heavyweight Champion February 6, 2012

Sirius B, the white-dwarf companion to Sirius, compared to the size of Earth

Stellar Afterlife February 1, 2012

A January 23, 2012 solar flare

Restless Sun January 30, 2012

Endeavour Crater, winter home of the Opportunity Mars rover

Winter Wonderland January 26, 2012

Infrared view of the spiral galaxy IC 342

Tangled Galaxy January 22, 2012

Earth's atmosphere distorts the Moon as seen from the International Space Statio

Squashed Moon January 17, 2012

Infrared view of starbirth in the vast nebula complex Cygnus X

Busy Nursery January 13, 2012

Artist's concept of a dark storm on the brown dwarf 2MASS 2139

Stormy Skies January 11, 2012

Artist's concept of the pulsar and planets in the system PSR B1257+12

Second-Chance Planets January 8, 2012

M1, the Crab Nebula, in a Hubble Space Telescope image

Crab Nebula January 6, 2012

The Moon and Hyades, night of January 5, 2012

Staring at the Bull January 5, 2012

Jupiter's Great Red Spot and the planet's four largest moons

An Eyeful of Moons January 2, 2012

Artist's concept of GRAIL spacecraft measuring the Moon's gravitational field

Lunar Arrival December 30, 2011

Saturn's moons Titan and Dione above Saturn, with Saturn's rings

Saturnian Traffic Jam December 26, 2011

View of Comet Lovejoy from the International Space Station

Christmas Comet December 23, 2011

Horsehead Nebula photographed through a McDonald Observatory telescope

3D Horsehead December 20, 2011

A comet plunges toward the Sun

Survivor: Comet December 16, 2011

Galactic Swirl December 14, 2011

Galileo spacecraft mosaic of Ganymede, largest moon of Jupiter

Two-Toned Moon December 5, 2011

Plumes of gas spew into space from the roiling surface of Betelgeuse, the bright

Stellar Timebomb December 1, 2011

Phoenix and Grus in the southern sky, late November evening

Rare Birds November 28, 2011

Ultraviolet view of Venusian clouds from Venus Express orbiter

Cloudy Skies November 26, 2011

Artist's concept of Curiosity rover on Mars

Ready to Roll November 23, 2011

Optical and radio image of the Carina Nebula, a vast stellar nursery

Birthplace of the Stars November 17, 2011

The Saturn Nebula, NGC 7009, as seen by Hubble Space Telescope

Saturn Simulacrum November 13, 2011

The Russian Phobos-Grunt Mars mission launches on November 8, 2011

Phobos Flop? November 11, 2011

The glow of the aurora from the International Space Station

Heavenly Lightshow November 6, 2011

The moon Phobos floats above Mars

Martian Target November 3, 2011

Galileo view of Gaspra, the first asteroid visited by a spacecraft

First Encounter October 29, 2011

An artist's concept of the darkest planet yet discovered

Dark World October 27, 2011

Cassini view of Saturn's moon Enceladus in front of the planet's rings

Saturnian Encounter October 25, 2011

Two globular clusters; a previously known one at right, and a new one in circle

Star City October 19, 2011

An aquanaut practices space exploration techniques underwater

Diving into the Future October 17, 2011

The giant volcano Pele erupts on Jupiter's moon Io

Fire Mountain October 13, 2011

Craters fill an ancient river channel on Mars

Martian Rapids October 10, 2011

Radio image of the Antenna galaxies

Boundless Starbirth October 5, 2011

Artist's concept of a starship

To Boldly Go... October 1, 2011

Stars and gas swirl around the black hole at the center of the Milky Way

Swirling Center September 27, 2011

IC 2944, a stellar nursery in the constellation Centaurus

Seeing Red September 22, 2011

Artist's concept of global ocean on Jupiter's moon Europa

Water World September 16, 2011

A thick torus of dust encircles a quasar

Water Works September 13, 2011

2011 image of the Apollo 12 landing site, from Lunar Reconnaissance Orbiter

Still Standing September 9, 2011

Map of the Moon's gravitational field

Lunar Lumpiness September 6, 2011

Messenger view of Mercury's southern hemisphere

Hard-to-Study Planet September 2, 2011

Composite view of a giant storm on Saturn from the Cassini spacecraft

Stormy Skies August 31, 2011

The star cluster M7

Aging Family August 28, 2011

NGC 4438 and NGC 4435, galaxies in Virgo

Beautiful Eyes August 25, 2011

Voyager 2 view of the Adams Ring at Neptune

Pulverized Moon August 22, 2011

Yerkes Observatory in Wisconsin is home to the world's largest refractor

Still Going August 18, 2011

The Necklace Nebula, the remains of a dying star in Sagittarius

Ring of Fire August 15, 2011

Panoramic view of Endeavour crater on Mars, imaged by the Opportunity rover

Final Destination August 11, 2011

Possible rivulets of water flowing on Mars

Drippy Planet August 8, 2011

International Space Station viewed from space shuttle Atlantis, July 19, 2011

Last Look August 3, 2011

Rock varnish on a rock from the Atacama Desert

Bacteria Colony? July 29, 2011

Scientists are studying rocks in Chile to learn about possible life on Mars

Looking for Life July 27, 2011

Chile's Atacama Desert is an analog for studying conditions on Mars

Mars on Earth July 26, 2011

Moon, Mars, and Aldebaran, July 26-28, 2011

Seeing Orange July 25, 2011

Atlantis lands on July 21, 2011, ending the space shuttle program

That's All, Folks! July 22, 2011

Dawn's first view of Vesta after entering orbit, July 2011

Settling In July 18, 2011

Dawn spacecraft view of asteroid Vesta shortly before entering orbit

First Stop July 15, 2011

Space shuttle Atlantis approaches the International Space Station, July 2011

Final Approach July 13, 2011

Delta Lyrae and the Summer Triangle

Seeing Double July 10, 2011

Atlantis launches on the final space shuttle mission, July 8, 2011

Last Call July 8, 2011

Cassini view of Iapetus, a moon of Saturn

Two-Toned Moon July 7, 2011

Messenger view of the surface of Mercury, June 2011

Hello, Sunshine July 2, 2011

Illustration showing the Great Comet of 1861

Great Comet June 30, 2011

The path of asteroid 2011 MD as it passes Earth, June 2011

Close Call June 25, 2011

Dust coats the spacesuit of Apollo 17 astronaut Gene Cernan

Dirty Moonwalker June 22, 2011

Phobos, one of the moons of Mars, passes by the planet Jupiter.

Out of Order June 20, 2011

NGC 3758, a system of two merging galaxies

Double Trouble June 11, 2011

A solar eruption on June 7, 2011

Big Splash June 7, 2011

Venus's path across the Sun during the transit of 1761

Bright Passage June 6, 2011

Artist's concept of upgraded Hobby-Eberly Telescope

Facelift for Science June 3, 2011

Stars and cities streak past space shuttle Endeavour

Fast Flyer June 1, 2011

A painting by Andrew Wyeth depicts preparations for a Gemini launch in the 1960s

Ready for Liftoff May 30, 2011

X-ray view of the Carina Nebula, a stellar nursery 7,500 light-years from Earth

Star Factory May 26, 2011

Alpha Magnetic Spectrometer-2 attached to the International Space Station

On Duty May 23, 2011

Artist's concept of a free-floating planet in the Milky Way galaxy

Free Agent May 19, 2011

Space shutle Endeavour launches on its final mission, June 16, 2011

Final Endeavour May 16, 2011

Cassini view of geysers on Saturn's moon Enceladus squirting far into space

Faithful Geysers May 13, 2011

M8, the Lagoon Nebula, is a vast stellar nurseary

Stellar Canvas May 6, 2011

Alan Shepard enters his capsule, then launches aboard Freedom 7, May 5, 1961

A-OK Flight May 5, 2011

Lightning strikes near space shuttle Endeavour, April 28, 2011

Close Call May 2, 2011

Moon and planets in the dawn sky, April 30/May 1, 2011

Dawn Encounter April 29, 2011

Artist's concept of TW Hydra, a young star encircled by a disk of gas and dust

Messy Youngster April 25, 2011

Artist's concept of the planetary system Kepler 11

Close Family April 22, 2011

A view of NGC 3582, a large stellar nursery in Karina

Life and Death April 19, 2011

The Opportunity rover crosses the Martian plains toward Endeavour crater

Crater Crawling April 16, 2011

Image of water distribution in northern hemisphere of Mars

Watery Mars April 14, 2011

Launches of Vostok 1, STS-1 (space shuttle Columbia)

Double Date April 12, 2011

Streamers of dust partially obscure the "seven sisters," members of the Pleiades

Veiled Sisters April 6, 2011

Infrared view of planetary nebula NGC 4361 in Corvus

Cotton-Candy Star April 3, 2011

MESSENGER's first color image of Mercury, March 29, 2011

First Glimpse March 31, 2011

Storm clouds swirl through Saturn's atmosphere in an image from Cassini

Artistic Storm March 28, 2011

New stars and the raw materials for more stars in the stellar nursery NGC 6729

Star Maker March 24, 2011

Earth and Moon from International Space Station

Blue Moon? March 21, 2011

Artist's concept of Messenger orbiting Mercury

Safe Arrival March 18, 2011

Mercury and Jupiter passing in the evening sky

Just Passing By March 13, 2011

X-ray and radio image of galaxy M87

Close to the Monster March 10, 2011

Irregular galaxy Henize 2-10, which appears to contain a supermassive black hole

Small But Powerful March 8, 2011

Giotto spacecraft view of Halley's Comet, March 1986

Halley's Armada March 5, 2011

Sky view from space shuttle Discovery, February 2011

Nice View March 2, 2011

Space shuttle Discovery launch, February 24, 2011

Last Show February 25, 2011

M78, a reflection nebula in Orion

Beautiful Reflection February 21, 2011

Comet Tempel 1 as seen by the Stardust spacecraft, February 14, 2011

Close Cometary Encounter February 17, 2011

Comet Tempel-1 from the Stardust spacecraft, February 14, 2011

Second Glance February 15, 2011

Newly forming planetary system around Beta Pictoris

Messy Star System February 10, 2011

Ground and orbital views of Opportunity rover at Santa Maria crater

Looking In February 8, 2011

Apollo 14 commander Alan Shepard poses with the American flag on the Moon

Long Journey February 6, 2011

Spiral galaxy NGC 3621 in the constellation Hydra

Galactic Sparkler February 2, 2011

Antares, brightest star of Scorpius, shines through the rings of Saturn

Peeking Giant January 28, 2011

False-color image of Orion Nebula from European Southern Observatory

Delicate Power January 21, 2011

Earth is in the middle of the Sun's habitable zone

In the Zone January 18, 2011

Reiner Gamma, a prominent lunar swirl in the Ocean of Storms

Lunar Swirl January 12, 2011

Hubble view of Hanny's Voorwerp and the galaxy IC 2497

In the Spotlight January 11, 2011

The Horsehead Nebula

Galloping Nebula January 8, 2011

Infrared image of the Lagoon Nebula

Blue Lagoon January 6, 2011

The Sun as seen from space

Close to the Sun January 3, 2011

Over the Rim December 31, 2010

Opportunity rover view of Santa Maria crater

Crater Climbing December 30, 2010

The Opportunity rover casts it shadow on the rim of a Martian crater

Martian Robot December 29, 2010

Geysers on Enceladus

Fizzy Moon? December 27, 2010

Western sky a couple of hours after sunset in late December

Happy Holidays! December 25, 2010

Eruption of gas from the surface of the Sun

Sun Power December 22, 2010

Total Lunar Eclipse of December 21, 2010

Disappearing Moon December 20, 2010

Shields like those of the USS Enterprise may protect real space travel

Shields Up! December 17, 2010

Visible and X-ray image of a supernova remnant in the Large Magellanic Cloud

Holiday Decoration December 16, 2010

Geminid Meteors December 13, 2010

Enceladus passes in front of Saturn's rings

Saturnian Iceball December 8, 2010

Japanese spacecraft Akatsuki at Venus

Venusian Dawn December 6, 2010

Sun glints off a lake on Saturn's moon Titan

Sparkling Lake November 30, 2010

IC 2118, the Witch Head Nebula

Witch Head Nebula November 26, 2010

China Clipper Sails the Pacific Ocean

Night Over Water November 22, 2010

NGC 7252, aka the Atoms-for-Peace galaxies

Atomic Pile-up November 20, 2010

Leonid Meteor Shower 2010

Seeing Sparks November 16, 2010

Lunokhod image of its tracks on the lunar surface

Found It! November 15, 2010

Voyager 1 view of Saturn, November 1980

Getting Acquainted November 12, 2010

Infrared image of CW Leonis, a giant star that is surrounded by soot

Steamy Star November 9, 2010

The California Nebula, in Perseus

Stately Nebula November 6, 2010

Comet Hartley-2 from Deep Impact Spacecraft

Fowl Comet? November 5, 2010

Deep Impact view of Comet Hartley-2

Closing In November 4, 2010

Ultraviolet image of the region around the Ghost of Jupiter Nebula

Astronomical Ghost October 31, 2010

Six Spiral Galaxies from European Southern Observatory

Galaxies Galore October 29, 2010

Cassini image of Saturn's moon Mimas, October 2010

Scarface October 25, 2010

Comet Hartley-2 from McDonald Observatory

Jolly Green Comet October 21, 2010

Hobby-Eberly Telescope at McDonald Observatory

Searching the Darkness October 15, 2010

Infrared view of Comet Hartley 2 from WISE

Heading for a Rendezvous October 6, 2010

Artist's concept of a protoplanetary disk with wide gaps

Planet Nursery October 4, 2010

Ground-based image of the galaxy cluster Abell 2151, in Hercules

Galaxies Galore October 1, 2010

False-color infrared view of Saturn and its aurora

Colorful Aurora September 28, 2010

Luna 16 diagram

To the Moon and Back September 24, 2010

The aftermath of an asteroid impact in the southern hemisphere of Jupiter

Giant Scar September 20, 2010

A multi-spectral view of a supernova remnant in the Small Magellanic Cloud

Life from Death September 17, 2010

MIT professor Dava Newman models a new type of space suit

Dressed for Success (in Space) September 15, 2010

Two planets and a star team up with the crescent Moon in the western evening sky

Moon and Companions September 10, 2010

NGC 4666, a starburst galaxy

Lively Galaxy September 3, 2010

Evaporating planet around the star HD209458

Puffy Planet August 26, 2010

Two Moons Rising August 16, 2010

Cassini snapped views of Saturn's moons Enceladus and Tethys.

Two Moons Rising August 16, 2010

Galactic Beauty August 11, 2010

M87 black hole

Busy Black Hole August 11, 2010

Messier 27

Heavy Lifting August 7, 2010

Rings and bubbles from a dying star

Jumping Through Hoops August 5, 2010

Two moons of Saturn are shaped like flying saucers, as seen by Cassini.

Flying Saucers! July 29, 2010

The largest lake in the southern hemisphere of Saturn's moon Titan.

Big (Foot) Lake July 27, 2010

Cosmic Bullets July 20, 2010

Stellar Sculptors July 15, 2010

A thick dust storm blows across Mars in this image from Mars orbit.

Dusty Skies July 12, 2010

A false-color image of Idunn Mons indicates that the Venusian volcano is still a

Still Going? July 9, 2010

The Milky Way galaxy and the afterglow of the Big Bang make up this all-sky imag

A Little of Everything July 6, 2010

Dione, one of the moons of Saturn, passes in front of the larger moon Titan.

Just Passing By June 30, 2010

Western Lineup June 27, 2010

A hot, massive star 'exhales' a breath of oxygen in this recent image from WISE.

Breath of Life June 22, 2010

The sky glows orange in this artist's concept of the atmosphere of Venus.

Dusky Skies June 15, 2010

An ultraviolet view of the spiral galaxy M81 shows young, hot stars in blue and

Grand Galaxy June 12, 2010

The Cassini spacecraft snapped this image of Saturn's moon Rhea from a distance

Close Moon June 7, 2010

Rings and Moons

Rings and Moons June 4, 2010

Big Blue Planet

Big Blue Planet June 1, 2010

The remains of a supernova explosion form complex loops and filaments in this co

Colorful Aftermath May 27, 2010

Starbirth Factories

Starbirth Factories May 24, 2010

The next Mars rover, Curiosity, zaps a Martian rock with a small laser in this a

War of the Worlds? May 19, 2010

A fish-eye image shows a laser firing from the Gemini North telescope in Hawaii.

Zapping the Sky May 17, 2010