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See SWNS story SWBRmarsdoor. Is there a doorway on Mars? That’s the question being asked by conspiracists online after NASA released a new picture taken by NASA Curiosity rover. Snapped by the explorer’s Mast Camera (Mastcam) on Sol 3466 (7 May), the grainy image appears to show a cleanly-cut hole in a rockface. There has been no official NASA explanation of the sighting, but that hasn’t stop debate online about just what it shows. One online user described the scene as “a formation on Mars which appears to be a portal and a wall nearby that looks artificial,” while another concluded “swear to God, there's at least 5 Martians camouflaged in there.”