Mercury may have gotten much of its polar ice within a single Mercurian day following a massive asteroid impact, a new study ...
Mercury’s polar ice deposits may have formed in just one Mercurian day after a giant comet or asteroid slammed into the ...
Scientists have discovered a possible second impact crater buried under more than a mile of ice in northwest Greenland. This follows the finding, announced in November 2018, of a 19-mile-wide crater ...