Forty-year-old lunar samples contain trace amounts of water.

Learn the origins of our Moon.

Discover how a revolutionary set of star-seeking telescopes is taking precision to the next level, allowing astronomers to spot details the size of a nickel seen from 16,000 km away.

Pluto in 2015...or bust.

The Milky Way and Andromeda Galaxy are on a collision course.

After a seven-year trip, the Cassini spacecraft arrived at Saturn in July 2004.