Rosetta instrument provided first-ever ultraviolet observations of a comet

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After a two-year orbital tour around comet 67P/Churyumov-Gerasimenko, ESA’s Rosetta spacecraft — carrying the Alice ultraviolet spectrograph — will end its mission on Sept. 30. Rosetta is the first spacecraft to orbit and escort a comet, and Alice, developed and operated for NASA, is the first instrument to obtain far-ultraviolet observations at a comet.
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