NASA posts image of a mysterious hole seen on the side of a Martian volcano

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NASA has shared a photo of a mysterious hole on the side of one of Marss largest volcanoes, an example of a ‘lava tube’ that could be used as the location of human settlements in the future.
The hole is on the side of Pavonis Mons, a volcano near the Martian… [+3604 chars]Source

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