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This star's death billions of years ago is challenging what we know about supernovae


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Bengaluru: Once upon a time, billions of years ago, a star died. It let out a pulse of extremely high energy a gamma ray burst (GRB), as the astronomers call it that was detected on Earth just last year. Lasting less than a second, it was the shortest of its kind ever observed. 
And it appears to have challenged some existing models that govern the way these bursts are seen.     
Astronomers looking through NASA’s Fermi Gamma-ray Space Telescope observed a pulse of extremely high energy in the form of a GRB on 26 August 2020. The GRB, the astronomers say, is the shortest known to have been caused by the death of a star.  ....

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Ghost particle travels 750 million light-years, ends up buried under the Antarctic ice


Ghost particle travels 750 million light-years, ends up buried under the Antarctic ice
Adam Mann
© Provided by Live Science
an image of a tidal disruption event occurring when a black hole feasts on a star
For the first time ever, scientists have received mysteriously delayed signals from two supermassive black holes that snacked on stars in their vicinity. 
In the first case, a black hole weighing as much as 30 million suns located in a galaxy approximately 750 million light-years away gobbled up a star that passed too close to its edge. Light from the event was spotted in April 2019, but six months later a telescope in Antarctica captured an extremely high-energy and ghostly particle a neutrino that was apparently burped out during the feast.  ....

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