Topic: Brett Denevi
NASA's Messenger probe, the first spacecraft ever to orbit Mercury, has already taken more than 20,000 images.
06/17/2011 04:56 pm
Mercury, the oddest of the rocky planets, has been little understood by scientists. But on a swing by the planet, NASA's Messenger sent back intriguing data about Mercury's surface minerals and volcanic activity.
11/04/2009 12:00 am