Rosetta makes first detection of molecular nitrogen at a comet

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ESA’s Rosetta spacecraft has made the first measurement of molecular nitrogen at a comet, providing clues about the temperature environment in which Comet 67P/Churyumov–Gerasimenko formed.

via ESA Space Science

http://www.esa.int/Our_Activities/Space_Science/Rosetta/Rosetta_makes_first_detection_of_molecular_nitrogen_at_a_comet