Spelunking on Mars!

The Discovery Channel is reporting that the Mars Odyssey spacecraft has relayed images of seven dark, nearly perfectly circular features ranging in diameter from 328 to 820 feet. At first the dark spheres puzzled scientists, but Odyssey's infrared camera then checked the daytime and nighttime temperatures of the circles and suggested they were, in fact, openings to subsurface spaces.

These caves are at a very high altitude and located on the sides of the volcano Arsia Mons. It is possible that if there was life on Mar or if there is life there now, it could have found shelter in this caverns. It will be interesting to see what they find in these caverns and if they find more now that they have an idea of what to look for.