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Saturn's time to shine

The ringed world reaches its 2015 peak this week, when it shines brightly all night

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Magnetar mystery

A neutron star is exhibiting some unusual X-ray behavior

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Uwingu Mars

Name a crater ... make an impact!

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Apollo exclusive

An in-depth interview, including video footage, with astronaut Jim Lovell on his experiences with Apollo 8 and Apollo 13

Explore now »

Ends July 24, 2015

Heart of darkness

Astronomers discover new kind of "dark" globular star cluster

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

Asteroid Day

The truth about the impact threat facing Earth

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Stellar beginnings

The first known example of a globular cluster about to be born

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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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Take the Universe with You!

Huge halo

The Andromeda Galaxy's halo is much bigger than previously thought

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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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Hubble at 25

How the space telescope changed the cosmos

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New podcast episode!

Avi Loeb: From cosmic origins to our galaxy’s fate

Listen now »

Saturn's time to shine

The ringed world reaches its 2015 peak this week, when it shines brightly all night

Learn more »

PICTURE OF THE DAYsee all »

The Pinwheel Galaxy

The Pinwheel Galaxy (M33) is a spiral galaxy approximately 3 million light-years from Earth in the constellation Triangulum. M33 is the third-largest member of the Local Group of galaxies, which includes the Milky Way, the Andromeda Galaxy (M31), and some 40 other smaller galaxies. It is one of the most distant objects you can see with the naked eye, but you need superb vision and an excellent site to do so. (7.2-inch Telescope Engineering Company APO180FL refractor at f/7.36, FLI ML-6303 CCD camera, LRGB image with exposures of 3, 1, 1, and 1 hour, respectively)
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