A Cosmic Photon May Be Challenging Einstein’s Physics

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A Cosmic Photon May Be Challenging Einstein’s Physics

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A mysterious ultra-high-energy photon from the brightest gamma-ray burst ever detected somehow survived a two-billion-light-year journey that standard physics says should have stopped it.

Scientists propose that axion-like particles and a possible violation of Lorentz invariance could explain its unexpected survival and delayed arrival—potentially offering clues to new laws of quantum gravity.

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