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doubletaxed88 t1_jb786ol wrote on March 6, 2023 at 11:23 PM

Reply to comment by Chichachachi in James Webb Telescope captures the same galaxy at three different points in time in a single mind-boggling image by mirzavadoodulbaig

Because they can see the various stages of the supernova in the three images, and supernovas are fairly well understood from a timing and energy mass ejection standpoint.