Photo of the Day

Associated Press
This image provided by NASA and taken by a camera aboard NASA’s Mars Reconnaissance Orbiter shows the equatorial plains region known as Elysium Planitia on Mars. Using a radar instrument aboard the spacecraft, scientists made a 3-D map of flood channels below the surface of Mars, apparently created by past flooding. The findings were reported online Thursday, March 7, 2013 in the journal Science. (AP Photo/NASA)

View gallery

500 photos

View Comments (2)