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Title : "This crash happened about 7 bn years ago, when the universe was half its current age, but is only being detected now because it happened so far away."
link : "This crash happened about 7 bn years ago, when the universe was half its current age, but is only being detected now because it happened so far away."
"This crash happened about 7 bn years ago, when the universe was half its current age, but is only being detected now because it happened so far away."
From "'It just sounds like a thud': astronomers hear biggest cosmic event since big bang/Researchers believe noise was two black holes colliding around 7 billion years ago, creating a previously unseen class of stellar object" (BBC).Lost in the collision was an enormous amount of energy in the form of a gravitational wave, a ripple in space that travels at the speed of light.... Because the detectors allow scientists to pick up the gravitational waves as audio signals, scientists actually heard the collision. For all the violence and drama, the signal lasted only a tenth of a second. “It just sounds like a thud,” Weinstein said. “It really doesn’t sound like much on a speaker.”So... it was heard as a tenth-of-a-second thud after traveling at the speed of light — light, not sound — for 7 billion years. I don't think they really heard the crash, but they picked it up, one way or another, after 7 billion years. It's mind-blowing to think of how far away that was.
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From "'It just sounds like a thud': astronomers hear biggest cosmic event since big bang/Researchers believe noise was two black holes colliding around 7 billion years ago, creating a previously unseen class of stellar object" (BBC).
Lost in the collision was an enormous amount of energy in the form of a gravitational wave, a ripple in space that travels at the speed of light.... Because the detectors allow scientists to pick up the gravitational waves as audio signals, scientists actually heard the collision. For all the violence and drama, the signal lasted only a tenth of a second. “It just sounds like a thud,” Weinstein said. “It really doesn’t sound like much on a speaker.”So... it was heard as a tenth-of-a-second thud after traveling at the speed of light — light, not sound — for 7 billion years. I don't think they really heard the crash, but they picked it up, one way or another, after 7 billion years. It's mind-blowing to think of how far away that was.
Thus articles "This crash happened about 7 bn years ago, when the universe was half its current age, but is only being detected now because it happened so far away."
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