Black spots have been discovered on Mars that are so dark that nothing inside can be seen. The spots might be entrances to deep underground caves. Here is an example, captured three weeks ago. This hole is about the size of a football field and is so deep that it is completely unlit by the Sun. Some say holes and underground caves like this could even support life and might be prime targets for future exploration. Does this remind anyone else of the face on Mars found by Viking in 70's? It's always exciting to think about the possibilities of the unknown. Given that Mars is a cold desert with nothing to sustain life, I doubt there's anything in those holes but cold and darkness. Still, makes you wonder what could be down there...
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