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Ghost particle from shredded star reveals cosmic particle accelerator


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IMAGE: Smoking gun: After the supermassive black hole tore the star apart, roughly half of the star debris was flung back out into space, while the remainder formed a glowing accretion.
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Credit: Credit: DESY, Science Communication Lab
Tracing back a ghostly particle to a shredded star, scientists have uncovered a gigantic cosmic particle accelerator. The subatomic particle, called a neutrino, was hurled towards Earth after the doomed star came too close to the supermassive black hole at the centre of its home galaxy and was ripped apart by the black hole s colossal gravity. It is the first particle that can be traced back to such a tidal disruption event (TDE) and provides evidence that these little understood cosmic catastrophes can be powerful natural particle accelerators, as the team led by DESY scientist Robert Stein reports in the journal ....

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