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Pluto February 19, 2016

Earth’s Moon February 19, 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

Facts and Figures June 10, 2010

Realm of the Giants June 10, 2010

Gemini, the Twins

Gemini, the Twins May 25, 2010

Taurus, the Bull

Taurus, the Bull May 25, 2010

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

Exoplanets May 21, 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

Mars on Earth Getting ready for Mars February 27, 2016

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

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

Arrow of Time Going forward in time February 16, 2016

Moon and Companions Two planets without moons February 5, 2016

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

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

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

Auriga The charioteer’s bright shoulders January 24, 2016

Zapped! Zapped by the Sun — twice January 18, 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

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

Featured Images

Backlit view of Pluto landscape from New Horizons

Hazy Skies September 22, 2015

Comet Crawl September 14, 2015

Artist's concept of a young Jupiter-like planet

Young Giant August 27, 2015

New Horizons view of young mountains on Pluto

Ice Mountains July 15, 2015

July 12 views of Charon and Pluto from New Horizons

Hours Away July 13, 2015

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

Best Shot July 7, 2015

Encounter between Venus and Jupiter, July 2015

Planetary Headlights July 2, 2015

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

Brilliant Encounter June 26, 2015

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

Worlds of Worlds June 9, 2015

The western evening sky of May 22, 2015

Crowded Skies May 22, 2015

Ringfest May 20, 2015

Image of a powerful solar flare on March 11, 2015

Solar Flare March 12, 2015

Artist's concept of Solar Max in orbit

Sun Watcher February 14, 2015

A brilliant aurora from the International Space Station

Fiery Sky January 21, 2015

Composite image of the Sun

Hot Sun December 24, 2014

Double Dribble November 20, 2014

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

Planet Tracks November 6, 2014

Postcard of the historic Elgin Watch Company Observatory in Illinois

Star Time October 25, 2014

Through the Glow September 16, 2014

Artist's concept of Solar Orbiter

Feeling the Heat July 4, 2014

Three solar flares in early June 2014

Solar Fireworks June 12, 2014

Venus, Mercury, and the earthshine-illuminated crescent Moon

Lighting the Shadows May 30, 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

Artist's concept of a solar sail

Sailing Along April 3, 2014

Venus Express movie showing south polar vortex

Double Vortex March 27, 2014

Lunar Reconnaissance Orbiter view on lunar north polar regions

Top o' the Moon March 19, 2014

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

Exploding Stars December 14, 2013

Annie Jump Cannon

Astronomical Pioneer December 10, 2013

Female "computers" at Harvard College Observatory

Data Processing Center December 9, 2013

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

Hot Rock October 31, 2013

Artist's concept of planet HAT-P7b

Hot Spot August 16, 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

Artist's concept of a blue exoplanet

Blue-Hot Planet July 13, 2013

Planetary conjunction, May 2013

Evening Traffic Jam May 25, 2013

The starry ceiling of Grand Central Terminal

Grand Sky February 2, 2013

Soyuz spacecraft approaches space station with Moon in background

Ready for Arrival December 31, 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

Apollo 17 astronaut Gene Cernan drives his lunar rover

End of the Road December 10, 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

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

First-quarter Moon

Moonwatch September 22, 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

False-color view of Comet Swift-Tuttle, 1992

Swift Comet July 16, 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

Apollo 17 at the rim of Shorty Crater, December 1972

Back to the Moon(rocks) June 11, 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

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

Seeing Double April 4, 2012

A powerful solar flare erupts on March 6, 2012

Stormy Skies March 8, 2012

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

Mighty Mars March 3, 2012

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

Up, Up, and Away! February 20, 2012

Dark lunar features are named seas or oceans

Split Personality February 9, 2012

A January 23, 2012 solar flare

Restless Sun January 30, 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

Phoenix and Grus in the southern sky, late November evening

Rare Birds November 28, 2011

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

Still Standing September 9, 2011

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

Last Call July 8, 2011

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

A-OK Flight May 5, 2011

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

Dawn Encounter April 29, 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

Mercury and Jupiter passing in the evening sky

Just Passing By March 13, 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

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

Long Journey February 6, 2011

Lunar crater gouged by Apollo 14 booster rocket

A Big Whack February 4, 2011

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

In the Zone January 18, 2011

The Sun as seen from space

Close to the Sun January 3, 2011

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

Japanese spacecraft Akatsuki at Venus

Venusian Dawn December 6, 2010

China Clipper Sails the Pacific Ocean

Night Over Water November 22, 2010

Lunokhod image of its tracks on the lunar surface

Found It! November 15, 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

Evaporating planet around the star HD209458

Puffy Planet August 26, 2010

Western Lineup June 27, 2010