Mars Water Debate Rages Discovery News

There’s no end in sight for the debate over whether Mars was once wet, warm and Earth-like, or forever a frigid world where water never had a chance to thaw and flow. In the latest foray, Mars researchers Sarah T. Stewart of the California Institute of Technology and Francis Nimmo of NASA Ames Research Center argue not only that the gullies running down crater walls must have been created by water, but that the alternative theory