Ice at Mercury's north pole, NASA says
Ice was discovered inside a 68-mile-diameter crater in the north polar region of Mercury, Tuesday, Nov. 27, 2012. (NASA / Johns Hopkins University Applied Physics Laboratory / Carnegie Institution of Washington)
Published Thursday, November 29, 2012 3:03PM EST
CAPE CANAVERAL, Fla. - A NASA spacecraft has confirmed there's ice at Mercury's north pole.
Scientists announced Thursday that the orbiting probe, Messenger, has found evidence of frozen water, even though Mercury is the closest planet to the sun. The ice is located in the permanently shadowed region of Mercury's north pole. It's thought to be at least 1.5 feet (0.46 metres) deep -- and possibly as much as 65 feet (19.8 metres) deep.
Scientists say it's likely Mercury's south pole also has ice, though there are no data to support it. Messenger orbits much closer to the north pole than the south.
Radar measurements, for years, have suggested the presence of ice. Now scientists know for a fact.
Messenger is the first spacecraft to orbit Mercury. It was launched in 2004.