Alien antimatter crashes into Earth

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Alien antimatter crashes into Earth

It came from outer space. And it was tiny.
RELATED TOPICS: NEUTRINOS | PHYSICS
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Erick Beiser/ICECUBE/NSF

In March 2021, after years of analyzing and confirming data, astrophysicists reported that the IceCube Neutrino Observatory, a detector buried at the South Pole, had picked up an unusual signal in 2016. It suggested that a particle called an antineutrino had crossed space and time — originating far beyond our galaxy — before smashing into Antarctica and releasing a particle shower in the ice.

According to the Standard Model of particle physics, every known type of particle has an antimatter counterpart (though there’s hardly any trace of antimatter in the universe today). More than 60 years ago, future Nobel laureate Sheldon Glashow predicted that if an antineutrino — the antimatter answer to the nearly massless neutrino — collided with an electron, it could produce a cascade of other particles. The “Glashow resonance” phenomenon is hard to detect, in large part because the antineutrino needs about 1,000 times more energy than what’s produced in the most powerful colliders on Earth.

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