The Rosetta Orbiter Spectrometer for Ion and Neutral Analysis (ROSINA) mass spectrometer aboard ESA’s Rosetta spacecraft has detected the noble gas argon, along with other gases, in the coma of 67P/Churyumov-Gerasimenko. Mosaic of four images taken by Rosetta’s navigation camera on September 19, 2014, at 28.6 km from the center of 67P/Churyumov-Gerasimenko. The images used for this mosaic were taken in sequence as a 2×2 raster over a 20 minute...
