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  • curprev 17:16, 9 February 2018Suitupandshowup talk contribs 368 bytes +368 Hole that leads to a lava tube, an entry point for a possible Mars colony Image from HiRISE http://hirise.lpl.arizona.edu/ESP_023531_1840 The dark spot turned out to be a "skylight," an opening to an underground cavern, that is 35 meters (115 feet)...