| Washington, Sept.22 : NASA's Mars Odyssey spacecraft has reportedly discovered entrances to seven possible caves on the slopes of a Martian volcano. The find is likely to fuel interest in potential underground habitats and sparking searches for caverns elsewhere on the planet.Initially, the discovery of very dark, nearly circular features ranging in diameter from about 328 to 820 feet puzzled researchers. Using Mars Odyssey's infrared camera to check the daytime and nighttime temperatures of the circles, the scientists concluded that they could be windows into underground spaces.Evidence that the holes may be openings to cavernous spaces comes from the temperature differences detected from infrared images taken in the afternoon and in the pre-dawn morning. From day to night, temperatures of the holes change only about one-third as much as the change in temperature of surrounding ground surface."They are cooler than the surrounding surface in the day and warmer at night," claimed Glen Cushing of the U.S.
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