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Rosetta spots two types of water ice on the surface of comet 67P

Rosetta spots two types of water ice on the surface of comet 67P

Water is abundant in comets, both in the nucleus and the surrounding cloud of gas. But even though scientists are sure it’s there, finding signs of it on the surface has been a surprisingly difficult task.

This week, a team examining data collected by the European Space Agency’s Rosetta spacecraft announced it has finally identified two large patches of water ice on the surface of comet 67P Churyumov-Gerasimenko, perhaps the most studied comet in history.

The elusive ice was detected in a region known as Imhotep, on the bottom part of the main lobe of the dumbbell-shaped comet. It was located on cliff walls and debris falls, and appeared as noticeably bright...

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