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Subject Black holes: Scientists measure the event horizon (point of no return)
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Original Message A black hole has a boundary called an event horizon. Anything that falls within a black hole's event horizon be it stars, gas, or even light can never escape.

"Once objects fall through the event horizon, they're lost forever"

Although the event horizon is an imaginary line that's impossible to observe, astronomers have imaged the region around a giant black hole at the center of a distant galaxy. That's allowed them to measured, for the first time, the closest stable orbit in which matter can circle the black hole. The findings were reported in this week's issue of the journal Science.

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