HARALD RITSCH / SCIENCE PHOTO LIBRARY HARALD RITSCH / SCIENCE PHOTO LIBRARY
Gamma ray burst (GRB), illustration. GRBs are focused beams of extremely high energy coming from distant galaxies. It is thought that they occur when a star is torn apart by powerful jets that form as it undergoes gravitational collapse. This massive short-lived burst of energy is hundreds of times brighter than an ordinary supernova or hypernova.
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