Dark pits on Mars are fascinating -- probably because they provide mysteries and possibilities. Could anything be inside? Or could this be a place where humans could set up a base since it would provide shelter from Mars' harsh environment?
looks like a water was flowing few hours before this photo was taken (upper left corner of the pic showing the bottom of the pit) :)
looks like a water was flowing few hours before this photo was taken (upper left corner of the pic showing the bottom of the pit) :)
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