Learn the origins of our Moon.
A revolutionary set of star-seeking telescopes is taking precision to the next level.
Pluto in 2015...or bust.
What does it take to plot a Universe's worth of space objects?
The Milky Way and Andromeda Galaxy are on a collision course.
Most asteroids and comets don't pass anywhere near Earth. Most.
After a seven-year trip, the Cassini spacecraft arrived at Saturn in July 2004.
To what lengths do scientists have to go to snare a gravitational wave?
Water once flowed on Mars—perhaps enough to harbor life.
Two technologies to find and describe faraway planets.