The cluster of stars in the bottom half of this photo is Messier 6, photographed in enough detail so that even Monsieur Messier would have immediately realized it's not a comet.
The object in the top half of the photo, on the other hand, is -- Comet Siding Spring, which this past weekend came within 140,000 miles of Mars.
Image Credit and Copyright: Rolando Ligustri (CARA Project, CAST)
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