NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Gamma ray burst formation. Image 2 of 5. Computer artwork of the core of a massive star just before the inner core (centre) collapses under its own weight in a gamma ray burst (GRB) event. Shells of iron, oxygen and carbon surround the inner core as the nuclear fusion that prevented collapse, fails. Such core collapses are used to explain GRBs. This collapsar theory says a black hole forms when the core collapses, and its spin or its magnetic field forms ejected material into jets. The jets are the source of the gamma rays of the GRB, a massive short-lived burst of energy that is hundreds of times brighter than an ordinary supernova. For the formation of a GRB, see images R670/148-152.
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