GRAIL is a future NASA mission that will probe the moon's gravity field.
Explore The Sky: Night & Day
In March, the celebration of the 2009 International Year of Astronomy continues with observing the sky by night and by day. Now is the perfect time to get outside and observe our celestial neighbors.
The Kepler Telescope
The Kepler Telescope, set to launch no earlier than March 6, 2009, will be the very first mission capable of finding Earth-sized planets within our own galaxy.
Our solar system's ringed giant has been a consistent source of surprises for 400 years.