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- 1Scientists explain how a 300 TeV photon reached Earth●Scientists explain how a 300 TeV photon could reach Earth
Researchers have offered an explanation for the detection of a photon carrying around 300 teraelectronvolts of energy striking Earth, one of the highest-energy photons ever observed. Such extreme gamma rays are not expected to survive interstellar travel, so scientists have described mechanisms that could allow the particle to complete the journey, a finding that challenges existing models of cosmic acceleration and propagation.