New images of the surface of Mars provide the first direct evidence that the climate of Mars changed during the last 100,000 years, much more recently than the hundreds of millions of years scientists had previously thought, according to Brown University geologist John Mustard. The high- resolution images show evidence of water ice closer to the equator than had previously been observed. Mustard, with graduate student Christopher Cooper and undergraduate Moses Rifkin, wrote about the findings in the July 26 issue of Nature.