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The seven-hour flash: Astronomers discover the longest gamma
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A gamma flash from July 2025 lasted seven hours, shaking previous models about the most violent energy flashes of the universe
The seven-hour flash: Astronomers discover the longest gamma
Astronomers spend careers watching stars collapse and explode, but an eruption spotted in July pushed beyond anything seen before. The event, called GRB 250702B, released high-energy radiation for nearly seven hours. That endurance broke every known record for its kind and forced scientists to rethink how such blasts are powered. Gamma-ray bursts are brief, fierce flashes from distant galaxies. Most last seconds, sometimes minutes. This one glow…
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