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What Causes Gamma-Ray Bursts? Their Ultrabright Flashes Hold Clues


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In July 1967, at the height of the Cold War, American satellites that had been launched to look for Soviet nuclear weapons tests found something wholly unexpected. The Vela 3 and 4 satellites observed brief flashes of high-energy photons, or gamma rays, that appeared to be coming from space. Later, in a 1973 paper that compiled more than a dozen such mysterious events, astronomers would dub them gamma-ray bursts. “Since then, we’ve been trying to understand what these explosions are,” said Andrew Taylor, a physicist at the German Electron Synchrotron (DESY) in Hamburg. ....

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Spectacular Gamma Radiation From Collapse Of Dying Star Could Change Understanding Of The Universe


Spectacular Gamma Radiation From Collapse Of Dying Star Could Change Understanding Of The Universe
This observation has challenged the established theory of gamma-ray bursts in the universe, the scientists said
By Edited by Gadgets 360 Newsdesk | Updated: 7 June 2021 12:54 IST
Photo Credit: DESY Science Communication Lab
Artist s impression of a relativistic jet of a gamma-ray burst
Highlights
These explosions occur when a massive star abruptly detonates
This Gamma-Ray Burst defies expectations, challenges earlier theory
A team of scientists in Namibia, in southwest Africa, has recorded a phenomenal cosmic explosion, the brightest so far, of gamma radiation from a collapsing star. They said usually these explosions occur when a massive star five or 10 times the mass of the Sun – abruptly detonates and turns into a black hole. The scientists said the gamma-ray burst (GRB) was one of the most energetic radiations ....

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