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Happy Anniversary Hubble!

25 years ago, the space shuttle Discovery launched with a payload that would change how we see the universe

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Anniversary image

NASA celebrates 25 years of Hubble with Westerlund 2

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Stirring signal

Pulsing light may indicate supermassive black hole merger

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The Asteroid Threat

A detailed story about the realities of asteroid impacts, past and future, featuring the latest statistics and stunning imagery

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Getting closer!

New Horizons has captured its first color image of the Pluto system

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Uwingu Mars

Name a crater ... make an impact!

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Sign Up for Astronomy's five-part Observing Essentials email series!

Ends July 24, 2015

Not-so-dark matter?

Dark matter interactions of an unknown nature could be occurring

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Indonesian Islands Eclipse

Explore Bali and witness a total solar eclipse in March 2016 with Astronomy magazine and TravelQuest International

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Exclusive Interviews

Podcasts featuring the biggest names in astronomy

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Infant organics

Complex organic molecules discovered in infant star system

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Join Astronomy's Aurora Adventure

Experience a once-in-a-lifetime northern lights tour with Astronomy magazine and TravelQuest International

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Take the Universe with You!

Superstars of Astronomy

New podcast episode! Debra Fischer: All About Exoplanets

Listen now »

Happy Anniversary Hubble!

25 years ago, the space shuttle Discovery launched with a payload that would change how we see the universe

Celebrate with us »

PICTURE OF THE DAYsee all »

The Ghost of Cassiopeia

The Ghost of Cassiopeia (IC 63) is an emission nebula that glows because of radiation from the nearby star Cih (Gamma Cassiopeiae). The reddish cloud of gas lies some 600 light-years away. (5-inch Explore Scientific 127mm apochromatic refractor, Quantum Scientific Instruments QSI 683wsg-8 CCD camera)
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