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comet.jpg

Astrophysics postdoctoral researcher Dustin Lang and a colleague had the bright idea to plug Internet-collected photographs of Comet 17P/Holmes into Astrometry.net to create this striking image of the comet's trajectory. The site analyzes patterns of stars in photos and calibrates what part of the sky is shown. 

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Photo by Dustin Lang (Princeton) and David W. Hogg (New York University)