Mars Odyssey's Thermal Emission Imaging System recently spotted seven dark spots near the planet's equator that scientists think could be entrances to underground caves. The football-field sized holes, potential caves, were spotted near a massive Martian volcano, Arisa Mons. Their openings range from about 330 to 820 feet (100 to 250 meters) wide, and one of them, Dena, is thought to extend nearly 430 feet (130 meters) beneath the planet's surface. Caves on Mars could become habitats for future explorers or could be the only structures that preserve evidence of past or present microbial life.Submitted by Shaun Saunders
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