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Grades PreK-3 (Ages 3-8)


Earth’s Moon February 19, 2016

Saturn's rings

Saturn February 10, 2016


Jupiter February 10, 2016


Earth February 10, 2016


Venus February 10, 2016

Taurus, the Bull

Taurus, the Bull May 25, 2010

Perseus, the Hero

Perseus, the Hero May 25, 2010

Leo, the Lion

Leo, the Lion May 25, 2010

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 Spica The end of a long journey February 26, 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

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

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

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

Winter Solstice Beckoning the Sun to return December 21, 2015

El Nath Sharing a bright star December 20, 2015

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

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

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

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

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

Orionid Meteors Reminders of a distant comet October 18, 2015

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

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

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

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

Moon and Aldebaran A stellar disappearing act September 3, 2015

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

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

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

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

Perseid Meteors Fiery skies from comet dust August 9, 2015

Lammas Splitting the difference on the calendar July 31, 2015

Moon and Saturn Following a stately planet July 24, 2015

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

Latest Sunsets Stretching the afternoon sunlight July 2, 2015

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

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

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

The Crow A confusing layout for a faint constellation May 16, 2015

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

El Nath Location, location, location May 2, 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

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

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

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

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

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

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

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

Solar Eclipse Extra darkness for the Arctic March 18, 2015

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

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

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

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

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

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

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

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

Perseus Taking the measure of a monster January 24, 2015

Occultations Illumination from darkness January 22, 2015

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

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

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

Winter Solstice Tilting back for the start of winter December 20, 2014

Moon and Saturn Swirling through the clouds of a giant planet December 17, 2014

Geminid Meteors Fireworks from the celestial twins December 11, 2014

Leonid Meteors Ready for a “streaky” meteor shower November 15, 2014

Moon and Jupiter Clouds of dust around a giant planet November 12, 2014

Bright Deceptive lights in the dawn sky November 2, 2014

Daylight Saving Time Saving daylight to save energy October 31, 2014

New Distance The Seven Sisters move farther away October 27, 2014

More Polaris A “hiccup” for the North Star October 23, 2014

Polaris Pacing off the distance to the North Star October 22, 2014

Solar Eclipse Darkening the afternoon sky October 21, 2014

Star Time Setting your watch by the stars October 20, 2014

Orionid Meteors Discovering a meteor shower October 18, 2014

Meteor Showers Meteor showers on two planets October 17, 2014

Moon and Jupiter Traveling to a deadly planet October 14, 2014

Lunar Eclipse A repeat performance for the Moon October 6, 2014

Enif The leading lights of Pegasus September 9, 2014

Great Square The above-average stars of the Great Square September 8, 2014

Harvest Moon The full Moon lights the way September 7, 2014

Dabih Covering up a passel of stars September 4, 2014

Alpha Lacertae A star with a bright profile August 27, 2014

Perseid Meteors Looking for sparks through the moonlight August 9, 2014

Sagittarius A steaming teapot in the southern sky July 23, 2014

Moon and Venus Visiting the cool mountains of Venus July 22, 2014

Feeling the Heat Looking at the Sun from near and far July 3, 2014

Moon and Regulus Locking the Moon in position June 30, 2014

Cygnus Rising A starry bird and a Mayan king June 29, 2014

Moon and Venus A brilliant early morning encounter June 22, 2014

Summer Solstice Plotting the motions of the Sun June 19, 2014

Leaping Gazelle A gazelle leaps across the sky June 14, 2014

Menkent The nearby shoulder of a centaur June 8, 2014

Moon and Spica Two stars with big futures June 7, 2014

Moon and Jupiter A study in contrasts in the evening sky May 31, 2014

Moon and Planets Squashing a giant planet May 30, 2014

Moon and Venus A case of deceptive beauty May 23, 2014

Moon, Venus, and Meteors Promise and possibility in the early morning sky May 22, 2014

Surprise Shower? Looking for a new meteor shower May 21, 2014

Saturn at Opposition Angling for a good view of Saturn May 11, 2014

Moon and Spica Violent scenarios for a binary star May 10, 2014

Eta Aquarid Meteors Naming a meteor shower May 3, 2014

Lyrid Meteor Shower Meteors for all occasions April 19, 2014

More Lunar Eclipse Big entertainment in the night sky April 13, 2014

Lunar Eclipse Changing the course of history April 12, 2014

More Moon and Venus Probing an unpredictable polar vortex March 26, 2014

Moon and Venus A roller-coaster ride for a bright planet March 25, 2014

Moon and Jupiter Building a solar system giant March 8, 2014

Moon and Venus Love and beauty in the dawn sky February 23, 2014

Moon and Spica A star of the first magnitude February 17, 2014

Brilliant Venus The “morning star” at its brightest February 12, 2014

Moon and Jupiter Creating a powerful magnetic field February 9, 2014

Orion’s Footstool A resting spot for the hunter January 31, 2014

Moon and Venus A beautiful dawn encounter January 26, 2014

Moon and Saturn Plunging into a turbulent world January 23, 2014

Moon and Spica Lining up a lunar encounter January 21, 2014

Moon and Regulus One set of stars, two pictures January 17, 2014

Moon and Jupiter A giant, icy moon January 13, 2014

Moon and Aldebaran Peeking at the Moon’s backside January 10, 2014

Jupiter at Opposition Pacing off the distance to a giant January 4, 2014

Vanishing Venus The demise of the evening star December 29, 2013

Moon and Saturn Riding waves in Saturn’s rings December 26, 2013

Moon and Jupiter Heating up a giant planet December 17, 2013

Geminid Meteors II A bright but temporary meteor shower December 12, 2013

Moon and Venus Lighting up a Venusian day December 3, 2013

Moon and Spica Following the rhythms of the night November 27, 2013

Moon and Mars A change of address for Mars November 25, 2013

Moon and Venus Lighting up a night sky November 4, 2013

Solar Eclipse A rare solar eclipse November 1, 2013

Moon and Jupiter The king of the Olympics October 23, 2013

Watery Skies Casting off into the Celestial Sea October 21, 2013

Orionid Meteors Moonlight and meteors October 19, 2013

Hunter’s Moon Hunting up a faint eclipse October 17, 2013

Draconid Meteors Sparks from the celestial dragon October 5, 2013

Autumn Nodding away from the Sun September 21, 2013

Moon and Venus Phasing in on the “evening star” September 7, 2013

Venus and Spica The always-hot “evening star” September 4, 2013

Unseen Saturn Unseen visions of a bright planet August 20, 2013

Moon and Venus An unforgiving environment August 8, 2013

Water World Diving into lunar research July 16, 2013

Moon and Saturn A radio story from a giant planet July 15, 2013

Moon and Spica Lining up a celestial encounter July 14, 2013

Zubenelgenubi A complex claw for the scorpion July 13, 2013

Zubeneschamali Balancing the scorpion’s claws July 12, 2013

Moon and Venus Heating up the “evening star” July 9, 2013

July Honoring a famous calendar maker June 30, 2013

More Moon and Planets Putting a new spin on the evening star June 10, 2013

Moon and Planets Lining up the “evening star” June 9, 2013

Sunquakes Rumbling through the Sun June 8, 2013

At the Edge At the edge of the solar system June 7, 2013

Young-Sun Paradox II A weight-loss plan for the Sun June 6, 2013

Young-Sun Paradox Turning up the thermostat June 5, 2013

Changing Sun Our steadily changing Sun June 4, 2013

A New Cycle Beginning a new lunar cycle May 23, 2013

More Moon and Jupiter The dusty space around Jupiter May 11, 2013

Annular Eclipse A ring of fire above the Pacific Ocean May 8, 2013

Eta Aquarid Meteors Sparks from a “wet” constellation May 3, 2013

Star Wheel Whirling around the North Star April 30, 2013

Moon and Spica Neighbors that stir things up April 23, 2013

Moon and Jupiter Measuring the skin of the Moon April 13, 2013

Celestial Navigation Navigating by the stars April 9, 2013

Argo Navis Sailing across the southern sky March 31, 2013

Moon and Companions A bright highlight on the dark Moon March 27, 2013

Spring Springing into a new season March 18, 2013

The Bull’s Horns The Moon takes the bull by the horns March 17, 2013

Moon and Saturn Wrapped in a magnetic embrace February 28, 2013

Alcyone Spinning up a bright young star February 26, 2013

Polaris III Poking into the life of a famous star February 20, 2013

Polaris II The un-steady beat of the North Star February 19, 2013

Polaris Guided by the North Star February 18, 2013

Moon and Companions From leading light to a pale second January 31, 2013

Great Square of Pegasus Connecting the dots of a starry square January 18, 2013

Moon and Saturn A giant storm that kept on going January 4, 2013

Moon and Spica Giant tides on giant stars January 3, 2013

Fire and Ice Fire and ice in the sky December 31, 2012

The Footstool A footstool for the hunter December 27, 2012

Venus and Antares Snow clouds on a hot world? December 21, 2012

The Sun III Looking for the surface of the Sun December 18, 2012

The Sun II The long trip before the journey begins December 17, 2012

The Sun Powering up the Sun December 16, 2012

Earliest Sunset Stretching out the December sunset December 15, 2012

Geminid Meteors Bright accents for a night of skywatching December 11, 2012

Jupiter at Opposition II Jupiter proves its superiority December 1, 2012

Feeble Eclipse Earth casts a feeble shadow on the Moon November 26, 2012

Venus and Saturn Wandering through the night sky November 24, 2012

Venus and Spica A star that’s more than meets the eye November 16, 2012

Triple Treat A skywatching triple feature November 15, 2012

Moon and Mars Mars hangs out in the evening sky November 14, 2012

Solar Eclipse Diving into a natural wonder November 11, 2012

Moon and Companions Taking a peek at the Moon’s backside November 9, 2012

Moon and Jupiter Cloudy skies on a giant planet October 31, 2012

Summer Markers Two summer stalwarts disappear October 20, 2012

Orionid Meteors A trail of lights from a messy comet October 19, 2012

Moon and Regulus Brightening up the Moon October 9, 2012

Moon and Jupiter A planet that’s a gravitational powerhouse October 3, 2012

Harvest Moon Celebrating the Mid-Autumn Moon September 28, 2012

Moonwatching Moonlight on an autumn night September 21, 2012

Moon and Venus Drying out a wet planet September 8, 2012

Moon and Companions The stars foretell the weather September 5, 2012

Seventh Month Miscounting the months August 31, 2012

Moon and Companions A traffic jam in the evening sky August 20, 2012

Moon and Mercury Some interesting sunrises and sunsets August 13, 2012

Moon and Venus A close encounter in the dawn sky August 11, 2012

Mars Tales A new visitor and an old myth August 2, 2012

Moon and Planets Admiring the twilight on another world July 23, 2012

In the Balance The Moon slips past the scorpion’s claws June 28, 2012

Moon and Mars Listening in to the Red Planet June 24, 2012

Moon and Mercury Peering into a small planet’s big heart June 20, 2012

Summer Solstice Lining up the summer solstice June 19, 2012

Unproductive Sun Outshining the Sun — sort of June 17, 2012

Lunar Secrets New secrets from old moonrocks June 11, 2012

Back to the Moon(rocks) New discoveries from old rocks June 10, 2012

Solar Spotters Getting a better bead on the Sun June 5, 2012

Venus Transit II A last-in-a-lifetime event June 4, 2012

Venus Transit Measuring out a solar-system ruler June 3, 2012

Partial Lunar Eclipse Taking a “bite” out of the Moon June 2, 2012

Transit and Eclipse Lining up with Earth and the Sun May 31, 2012

Moon, Mars, and Regulus Dark ice at the Moon’s poles May 27, 2012

The Llama The sparkling eyes of the llama May 25, 2012

Happy Coincidence A beautiful scientific coincidence May 17, 2012

Serpens Piecing together a celestial snake May 11, 2012

Leo’s Outlines Outlining the celestial lion March 16, 2012

Moon, Saturn, and Spica A stellar weight-loss plan March 8, 2012

Secret Mars Unlocking the secrets of the Red Planet March 1, 2012

Leap Day Leaping into the modern calendar February 28, 2012

Leaving the Ring Passing through a ring of stars February 4, 2012

Space Rocks II Studying pieces of other worlds January 18, 2012

Featured Images

Total lunar eclipse, October 2014

Lunar Eclipse September 26, 2015

The western evening sky of May 22, 2015

Crowded Skies May 22, 2015

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

Disappearing Sun March 20, 2015

Artist's concept of Solar Max in orbit

Sun Watcher February 14, 2015

Cassini view of Jupiter from 6 million miles

Turbulent Giant February 6, 2015

Composite image of the Sun

Hot Sun December 24, 2014

Artist's concept of Epsilon Aurigae

Playing Frisbee November 23, 2014

Postcard of the historic Elgin Watch Company Observatory in Illinois

Star Time October 25, 2014

Jupiter's radiation belts

Jovian Shields October 15, 2014

The Moon occults Dabih, a star in Capricornus

Celestial Cover-Up September 5, 2014

Artist's concept of Solar Orbiter

Feeling the Heat July 4, 2014

Venus, Mercury, and the earthshine-illuminated crescent Moon

Lighting the Shadows May 30, 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

Peek-a-Boo January 31, 2014

The Great Square of Pegasus

Double Duty September 12, 2013

LADEE launch, September 6, 2013

Moon Bound September 7, 2013

Saturnian Heat Rays August 21, 2013

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

First Sunlight July 31, 2013

Cassini monitors Saturn's magnetic field

Radio Story July 16, 2013

GRAIL map of lunar surface gravity

Lunar Lumpiness April 14, 2013

Cassini views Saturn's magnetic field

Solar Sculptor March 1, 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 Sun's structure

Powerhouse December 17, 2012

Gravitational map of the Moon compiled by the GRAIL mission

Lunar Attraction December 15, 2012

Voyager 1 view of Jupiter's cloudsk

Artistic Clouds November 1, 2012

Orionid Meteor Shower

Orionid Meteors October 20, 2012

Cassini view of Saturn, October 2012

Saturn Looms Large October 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

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

Illustration of annular eclipse of May 20, 2012

In the Zone May 18, 2012

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

Moon on a String May 11, 2012

Saturn and its rings as seen by Cassini

Subtle Color April 15, 2012

Dark lunar features are named seas or oceans

Split Personality February 9, 2012

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

Veiled Sisters April 6, 2011

Earth and Moon from International Space Station

Blue Moon? March 21, 2011

Lunar crater gouged by Apollo 14 booster rocket

A Big Whack February 4, 2011

The Sun as seen from space

Close to the Sun January 3, 2011

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

Geminid Meteors December 13, 2010

Japanese spacecraft Akatsuki at Venus

Venusian Dawn December 6, 2010

Leonid Meteor Shower 2010

Seeing Sparks November 16, 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

False-color infrared view of Saturn and its aurora

Colorful Aurora September 28, 2010

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

Giant Scar September 20, 2010