A photon that challenges Einstein: According to current physics, it should never have reached Earth

by National Institute for Astrophysics (INAF)

edited by Sadie Harley , reviewed by Robert Egan

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Add as preferred source Artist’s impression of a beam of ultra-high-energy photons emitted by GRB 221009A travelling through quantum spacetime. Credits: INAF / Giorgio Galanti / AI-generated How did a photon survive a journey of more than 2 billion light-years when, according to known physics, it should have been absorbed long before reaching Earth? This is the question at the heart of a new study by Giorgio Galanti (INAF) and Marco Roncadelli (INFN), accepted for publication in Physical Review Letters .