Observations by NASA's Mars rover Curiosity have revealed areas with gravel and pebbles that are characteristic of a former riverbed. Researchers have analyzed their shapes and sizes and the rounded pebbles clearly show that there has been flowing water on Mars.
Fuente : http://feeds.sciencedaily.com/~r/sciencedaily/~3/i...
Fuente : http://feeds.sciencedaily.com/~r/sciencedaily/~3/i...