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Tracing Ghost Particles Back to a Distant Black Hole

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IceCube Neutrino Observatory, Antarctica

The IceCube Neutrino Observatory in Antarctica, where the tiny particle believed to have originated in a supermassive black hole was observed last year.

Credit: Felipe Pedreros, IceCube/NSF

It was the smallest bullet you could possibly imagine, a subatomic particle weighing barely more than a thought, and a cosmic blunderbuss, a supermassive black hole, squirting fire down a gravitational gun barrel.

From The New York Times
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