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The original was posted on /r/todayilearned by /u/Flurb4 on 2024-10-10 20:28:50+00:00.

Original Title: TIL that Comet Swift-Tuttle is the largest comet to make repeated close approaches to Earth. A collision would release 27 times the energy of the impact that caused the extinction of dinosaurs. It has been described as “the single most dangerous object known to humanity”.