Comet 67P Churyumov-Gerasimenko, seasonal ice cycle

Comet 67P Churyumov-Gerasimenko, seasonal ice cycle

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Caption: Comet 67P/Churyumov-Gerasimenko, seasonal ice cycle. Images showing the seasonal cycle of water ice on Comet 67P/Churyumov-Gerasimenko on 1st August 2014 (left) and a year later, on 30th August 2015 (right), shortly after the comet's closest approach to the Sun. Bluer colours indicate portions of the surface that are richer in water ice. Here, the entire surface turned increasingly bluer as it approached the Sun, and gradually turned redder again as it moved away. As the comet moved closer to the Sun and its activity increased, the outgassing of water vapour and other gases lifted off large amounts of dust, exposing more of the ice-rich terrain underneath. Imaged by the OSIRIS narrow-angle camera on NASA's Rosetta satellite.

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