9 years ago
Water ice found on the surface of comet 67P
For the first time, scientists have spotted large patches of water ice on the surface of a comet, thanks to instruments aboard the European Space Agency's Rosetta orbiter. The finding, published Wednesday in Nature, solves a long-standing mystery about water ice in comets. Scientists already knew that the coma - the expansive cloud of gas surrounding the comet's nucleus - is dominated by water molecules. They also knew that water ice is...
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