A mysterious hole on has sparked speculations that it could be a gateway to ancient life.
The crater-like opening, about 150 feet across, sits on the edge of an ancient volcano, and scientists have suggested it could be protecting lifeforms from the Red Planet's radiation and harsh conditions.
While researchers are unsure how deep the pit goes, they said it is likely an underground that formed during a volcanic explosion - and the deep tunnel could serve as a shelter for astronauts set to put boots on the Martian world.
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