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Big eater

Research indicates that the giant elliptical galaxy M87 has swallowed an entire normal-sized galaxy in the last billion years

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Hubble at 25

How the space telescope changed the cosmos

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Two for one

Simulation suggests black holes may make ideal dark matter labs

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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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Venus volcanism

Evidence of hot lava flows discovered on Venus

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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

Stellar beginnings

Best observational evidence of the universe's first-generation stars

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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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Asteroid Day

The truth about the impact threat facing Earth

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Big eater

Different faces of Pluto emerging in new images from New Horizons

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Editor David J. Eicher conducts extensive interviews with the world's top astrophysicists, planetary scientists, and cosmologists

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Hello, Philae!

Rosetta's lander wakes up from hibernation on Comet 67P

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Big eater

Research indicates that the giant elliptical galaxy M87 has swallowed an entire normal-sized galaxy in the last billion years

Learn more »

PICTURE OF THE DAYsee all »

The Dark River

This wide-field shot of the region of Rho Ophiuchi shows many red emission and blue reflection nebulae and even a bright globular cluster — M4. The most prominent feature, however, is the so-called Dark River, a thick lane of dust and ultra-cold gas that blocks the light from more distant stars and nebulae. (Canon 6D DSLR, Canon EF 200mm f/2.8L II USM lens set at f/3.5, ninety-five 10-minute color exposures at ISO 200 stacked with seventy-sour 10-minute Hydrogen-alpha exposures at ISO 1600)
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