Caves On Mars?

High on the slopes of an old volcano called Arsia Mons, NASA scientists have discovered seven strangely circular holes that appear to lead deep into the interior of Mars. Dubbed the seven sisters, the holes emit temperatures significantly different than the surrounding terrain, causing scientists to believe they are openings - like skylights - into large subsurface caverns or caves. The photos below were taken by NASA's Mars Odyssey spacecraft currently in orbit around the red planet.

The mysterious holes have been named Dena (A), Chloe (B), Wendy (C), Annie (D), Abby (E1), Nikki (E2), and Jeanne (F). Below is a close-up of Wendy.

Speculation is running high as to the possibility of the protected, underground "caves" at the bottom of these holes being habitats for some form of Martian life! At the very least, they offer the potential to become habitats for the first humans who will be visiting Mars in the near future.

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