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Stories about: valleys

Martian Crater Wall Reveal Signs of Former Active Processes In a new image made available by scientists at the NASA Jet Propulsion Laboratory (JPL), in Pasadena, California, traces of active processes inside Martian craters can be clearly seen. The variety and complexity of these past events puzzle astronomers, which are not forced to revise existing knowledge of how the past... 26 November 2009 07:08 GMT New Evidence That Mars Once Had an Ocean Scientists at the Northern Illinois University (NIU) have recently announced that they managed to develop a new computer-generated map of the Red Planet, which adds more proof to the theory that claims a liquid ocean of water once existed on Mars. The team collaborated with colleagues from the Lunar and Planetary Ins... 23 November 2009 11:11 GMT