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Astronomers of Reddit: It seems all cool "large-scale" events take either billions of years to develop or just a few moments to occur. Are there any fun "large" events (galactic?) that occur over more observable timelines (e.g. days, weeks, or months?)

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Astronomers of Reddit: It seems all cool "large-scale" events take either billions of years to develop or just a few moments to occur. Are there any fun "large" events (galactic?) that occur over more observable timelines (e.g. days, weeks, or months?)	1879