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The Longest GRB Ever Detected Is An Intriguing Puzzle
In July 2025, telescopes detected a gamma-ray burst (GRB) that lasted seven hours. Most GRBs last only milliseconds, or a few minutes. Only a handful have lasted longer than that, and July's GRB was the longest ever detected. It hints at a new, exotic type of explosive event, and astronomers have a few candidates.
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