Comet Churyumov-Gerasimenko (photo: ESA)
From ESA (European Space Agency):
http://www.esa.int/spaceinimages/Images/2015/10/Rosetta_s_detection_of_molecular_oxygen
Rosetta has made the first detection of molecular oxygen at a comet. The results presented in this graphic are based on data collected by the Rosetta Orbiter Spectrometer for Ion and Neutral Analysis Double-Focusing Mass Spectrometer (ROSINA-DFMS) between September 2014 and March 2015 when Rosetta was still on the approach to the Sun along its orbit...
Read the rest at the link given.
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