Global Warming on Mars

21 Mar 2011

At www.physorg.com/print219842545.html there is a story, 'Chasma Boreale, Mars' with an image supplied by NASA. The chasm is a long flat floored valley that cuts deep into the Mars polar ice cape. Its walls rise up 4600 feet and it seems the ice has retreated as sheets of sand are emerging that accumulated in earlier ice free periods. The depiction comes from images taken between 2002 and 2005 by the Thermal Emissions Imaging System onboard the Mars Odyssey spacecraft. Melting ice on Mars appears to replicate melting mountain glaciers on the earth - why?