An article from news.com, discussed the new discoveries on the Martian surface today. The Mars Odyssey Spacecraft has detected the openings of seven caves on a volcano named Arsia Mons. Infrared cameras have detected that the opening is cooler than the surrounding areas in the afternoon (above, middle) and warmer than the surrounding areas at night (above, right).
The above picture is of one of the seven caves and has been named "Annie". Six other cave entrances have been found on Arsia Mons and together they are being called the "Seven Sisters" (below). The high altitude of the caves make it unlikely that they could be used for human shelter, but who knows what could be hiding inside of them?
The press release from NASA may be seen here:http://www.nasa.gov/mission_pages/odyssey/odyssey-20070921.html
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