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Originally posted by wrkn4livn
Looks like your standard Martian volcano to me...
One thing is for certain: These holes don't form without help. Usually it means water is the cause or lava...though the process could've taken years (hundreds, thousands?)
Originally posted by readytorevolt
The dark spot turned out to be a "skylight," an opening to an underground cavern, that is 35 meters (115 feet) across. Caves often form in volcanic regions like this when lava flows solidify on top, but keep flowing underneath their solid crust. These, now underground, rivers of lava can then drain away leaving the tube they flowed through empty. We can use the shadow cast on the floor of the pit to calculate that it is about 20 meters (65 feet) deep.
Originally posted by Imtor
Why cooled down lava? Yes it's possible but I think an object that impacted at an angle and dug the ground may have caused this caves too. That is it's not a cave just a crater under angle and is seen as a cave. Unless they stop these primitive missions and not do one mission to Mars for once.. no one will know.