Event horizon observations

X-ray pulse detected near event horizon as black hole devours star

"The signal appears to periodically brighten and fade every 131 seconds, and persists over at least 450 days."

"Given the signal's stable proximity to the black hole, and the black hole's mass, which researchers previously estimated to be about 1 million times that of the sun, the team has calculated that the black hole is spinning at about 50 percent the speed of light."


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