Martian clays were not all formed by the action of liquid water
Monday, September 10, 2012 - 14:00
in Astronomy & Space
Discovered in 2005, the clays of the southern hemisphere of Mars are often considered to be evidence for the existence of liquid water on the planet at a period in the very distant past between 4.5 and 4 billion years ago. However, work carried out by a French-US team calls this interpretation into question.