The MAVEN (Mars Atmosphere and Volatile EvolutioN) spacecraft, launched on November 18, 2013, completed its voyage on September 21, captured into a wide, elliptical orbit around Mars. MAVEN's imaging ultraviolet spectrograph acquired this image data from an altitude of 36,500 kilometers in Mars upper atmosphere. In false color, the three ultraviolet wavelength bands show light reflected from atomic hydrogen (in blue), atomic oxygen (in green) and the planet's surface (in red). Low mass atomic hydrogen is seen to extend thousands of kilometers into space, with the cloud of more massive oxygen atoms held closer by Mars' gravity. Both are by-products of the breakdown of water and carbon dioxide in Mars' atmosphere. The data can be used to determine the rate of water loss over time.