NASA's Curiosity Finds Ancient Streambed on Mars

NASA Mars Rover "Curiosity" finds remnants of an ancient streambed on Martian surface. Curiosity science team member Sanjeev Gupta explains how rounded pebbles spotted by the rover are convincing evidence of an ancient streambed on Mars and William Dietrich explores the relationship between river fans found in California's Death Valley on Earth and similar fans in Gale Crater on Mars.NASA's Curiosity rover found evidence for an ancient, flowing stream on Mars at a few sites, including the rock outcrop pictured here, which the science team has named "Hottah" after Hottah Lake in Canada's Northwest Territories.

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