The next Mars rover, Curiosity, is scheduled to launch Saturday. It's the first Mars rover to jettison solar panels for nuclear power, meaning it can go places and do things others couldn't.
Tatooine is the mythical home of Luke Skywalker. Now, scientists have identified a planet in a binary system 200 light-years away, although the planet is more like Saturn in mass and makeup.
The design of the new NASA rocket draws on key systems from the space shuttle and Ares programs. The agency anticipates launching the first demonstration version of the rocket by 2017.
Vesta and Ceres, the two largest objects in the asteroid belt, have mystified scientists for centuries. With NASA satellite Dawn on final approach to Vesta, the wait is almost over.
Satellite Cassini flew through geyser plumes spouting from Enceladus and gathered ice crystals. These crystals are salt-rich, suggesting that a hidden salty sea lurks beneath Enceladus's icy cap.
NASA's Messenger craft has been orbiting Mercury for 88 days. Among its findings: a Saturn-like magnetic field, high concentrations of sulfur, and some support for the notion there is water ice in shadowed craters.