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Mars
Mars today is a cold, deserted planet. Long ago, this planet was warmer and wetter. Mars once had oceans in its past. Mars and Venus was alot like this. Mars grew cold because it lost its interior heat, which caused volcanoes to stop erupting. Today, Mars has ice caps. Some scientists speculate that underneath the icecaps could be an underground water ocean. On Earth, whenever we find water, we find life.