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Comet C/2021 A1 Leonard with Messier 3 This spectacular image shows comet C/2021 A1 — a.k.a. Leonard — passing the distant Messier 3 globular cluster. It was taken by amateur astrophotographer Gregg Ruppel of Tucson, Arizona, on December 3 through a telescope-mounted camera. Greg Leonard, an astronomer with the Catalina Sky Survey, spotted C/2021 A1 in January 2021. Gregg Ruppel