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http://phys.org/news/2016-01-ice-surface-comet-67p.html
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 one of the main components of the nucleus. But until now, traces of water ice on the surface of the comet had been difficult to detect.