NASA's Mars Atmosphere and Volatile Evolution (MAVEN) spacecraft obtained this ultraviolet image of hydrogen surrounding comet C/2013 A1 Siding Spring on Oct. 17, 2014, two days before the comet's closest approach to Mars. The Imaging Ultraviolet Spectrograph (IUVS) instrument imaged the comet at a distance of 5.3 million miles (8.5 million kilometers).
Fuente : http://feeds.sciencedaily.com/~r/sciencedaily/~3/A...
Fuente : http://feeds.sciencedaily.com/~r/sciencedaily/~3/A...