Issue Date: November 21, 2016
Solid CO2 spotted on a comet
Before it ended its mission in September, the European Space Agency’s Rosetta spacecraft, which began orbiting comet 67P/Churyumov-Gerasimenko in 2014, made the first observation of solid CO2 on a comet. The craft also unveiled complex sublimating and freezing patterns taking place in the comet’s water ice and dust. These phenomena result from seasonal and diurnal extremes that a comet experiences during its elliptical orbit around the sun. An international team led by Gianrico Filacchione of . . .
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