Gullies at the Edge of Hale Crater, Mars

This image from NASA's Mars Reconnaissance Orbiter shows gullies near the edge of Hale crater on southern Mars.Martian gullies carved into hill slopes and the walls of impact craters were discovered several years ago. On Earth, gullies usually form through the action of liquid water -- long thought to be absent on the Martian surface. Whether liquid water carves gullies under today's cold and dry

NASA Scientists Dive Deep to Learn More about Life on the Moon, Mars

NASA and the Canadian Space Agency invite journalists and the public on Tuesday, July 14, to observe the international, multidisciplinary Pavilion Lake Research Project team as it studies the origin of rare freshwater carbonate rock structures that thrive in Pavilion Lake, British Columbia, Canada.Reporters will have an opportunity to interview Pavilion Lake Research Project scientists from 9 a.m