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This is an image of Comet Siding Spring C/2013 A1. Sunlight reflected from the comet's dust, produces most of the light in this image, appears yellow; violet shows ultraviolet light produced by hydroxyl (OH), a molecular fragment of water.
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06.19.2014

Swift Satellite Tallies Water Production on Mars-Bound Comet

This composite of C/2013 A1 (Siding Spring) merges Swift UVOT images taken between May 27 and 29, 2014. Sunlight reflected from the comet's dust, which produces most of the light in this image, appears yellow; violet shows ultraviolet light produced by hydroxyl (OH), a molecular fragment of water.

Image Credit: NASA/Swift/D. Bodewits (UMD), DSS

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