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Earth’s Moon February 19, 2016

Jupiter's Moons February 19, 2016

Saturn's rings

Saturn February 10, 2016

Jupiter

Jupiter February 10, 2016

Mars

Mars February 10, 2016

Venus

Venus February 10, 2016

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

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

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

Exploding Stars May 21, 2010

Cosmic Beacons May 21, 2010

Equipment Tips May 14, 2010

What to Look For May 14, 2010

Become a Stargazer April 14, 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

Mercury March 7, 2006

Radio Programs

Leap Day Leaping with the seasons February 29, 2016

Moon and Mars A neighbor world gets brighter February 28, 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

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

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

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

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

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

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

Featured Images

Total lunar eclipse, October 2014

Lunar Eclipse September 26, 2015

First Eyes on Mars July 13, 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

A mosaic of spacecraft images shows the varied surface of Ganymede

Hiding an Ocean June 20, 2015

The western evening sky of May 22, 2015

Crowded Skies May 22, 2015

Sunset at Gale Crater, Mars, April 2015

Blue Skies May 14, 2015

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

Hot Lake March 29, 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