This is a giant patch of frozen water inside an unnamed impact crater on Mars. The existence of this water-ice patch on Mars makes life a more likely possibility and raises the prospect that past or present life will one day be detected. The crater with ice disc is on the Vastitas Borealis, a broad plain that covers much of Mars’s far northern latitudes. The crater is 35 km wide, with a maximum depth of about 2 km. The image was taken by the High Resolution Stereo Camera on ESA’s Mars…