Yhn SciencePhysics first seen 1 d ago, last 1 h ago, peak #5
Scientists explain how a 300 TeV photon reached Earth
Original: Scientists explain how a 300 TeV photon could reach Earth
Researchers have put forward an explanation for how a photon with an energy of 300 teraelectronvolts — among the most energetic gamma rays ever detected — could have travelled to Earth. The finding addresses a long-standing puzzle, since such high-energy photons should be destroyed by interactions with background light on their way through the universe, and the proposed mechanism sheds light on extreme cosmic accelerators.
Why now: The detection of an extraordinarily energetic photon challenges known physics about how such radiation survives intergalactic travel.
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