The US will launch the Kepler spacecraft Friday to look for other Earths.
The breakthrough images include a three-planet system around a sun-like star.
New data from NASA’S MESSENGER spacecraft suggests Mercury was shaped by volcanism.
Geoff Marcy, astronomy’s Indiana Jones, had 10 days, one telescope, and a universe of planets to discover.
Microscopic organisms thrive in polar-ice 'brine channels' whose conditions mirror some of those found in space.