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New Horizons Makes History

A flyby of Pluto produces stunning images and insights

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MAGAZINE HIGHLIGHTS

asteroids

How Asteroids Keep It Together

Astronomers learn what binds a potentially deadly space rock.
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Where Did Earth's Water and Ammonia Come From?

Thursday, July 23, 2015
Meteorites likely brought water here, but it didn't stick around until after our planet cooled off.
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Super-Earths Might Be Our Best Bet For Finding Alien Life

Worlds a few times larger than ours litter our universe, and they have good prospects for habitability.
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