Water flowed ‘recently’ on Mars
Posted on December 7, 2006 Comments (0)
In both cases, scientists found bright, light-coloured deposits in the gullies that were not present in the original photos. They concluded that the deposits – possibly mud, salt or frost – were left there when water recently cascaded through the channels.
Other scientists think it possible that gullies like this were caused not by water but by liquid carbon dioxide.