M13: The Great Globular Cluster in Hercules via NASA https://j.mp/3eZUZFt https://j.mp/3yr3IYL

2021-05-20 aki

M13: The Great Globular Cluster in Hercules via NASA https://t.co/pnOUA6tIjJ pic.twitter.com/kwj7UKqOWQ

— Dr.(Shirai)Hakase #StayHome🦠 (@o_ob) May 20, 2021

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