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Zombie stars?

NuSTAR has observed a baffling X-ray glow at the heart of the Milky Way that could involve different classes of stellar corpses

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Take the Universe with You!

Thanks for everything

MESSENGER's Mercury mission is finally complete

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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 »

Hubble at 25

How the space telescope changed the cosmos

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Stirring signal

Pulsing light may indicate supermassive black hole merger

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

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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BaliRotator

Indonesian Islands Eclipse

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

View the brochure »

Ends July 24, 2015

Not-so-dark matter?

Dark matter interactions of an unknown nature could be occurring

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Join Astronomy's Aurora Adventure

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

See the brochure »

Asteroid Day

The truth about the impact threat facing Earth

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Infant organics

Complex organic molecules discovered in infant star system

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Zombie stars?

NuSTAR has observed a baffling X-ray glow at the heart of the Milky Way that could involve different classes of stellar corpses

Learn more »

PICTURE OF THE DAYsee all »

The glorious Sun

Don’t let anyone tell you nothing is happening on the Sun right now. This Hydrogen-alpha image reveals numerous prominences, filaments, and flares. (4-inch Lunt single-stack Hydrogen-alpha telescope, Imaging Source DMK41 monochrome CCD camera, 1,000 frames each of full disk and then of prominences with the best 50 to 60 of each stacked to produce the final image, taken April 1, 2015, at 1:39:07 p.m. EDT)
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