We’ve known for a decade or more that there is water, albeit frozen, on Mars. Now, a new analysis of satellite images reveals the whereabouts of eight substantial ice deposits. The US Geological Survey has published the findings in the journal Science , saying that there’s ice under a third of the surface of Mars. Some of the ice is just a few feet below the surface, while other deposits are under 300 feet of rocks and dust. This is important information for those who are working on sending