Astronomers say there are imperceptible gravitational waves generated before the collision that are hitting us right now.
The Caltech research team came across this rare case of a binary, the term for two big black holes orbiting one another, while studying quasars.
That led them to look at the quasar's activity captured over decades from other radio telescopes across the world and NASA's "When we realized that the peaks and troughs of the light curve detected from recent times matched the peaks and troughs observed between 1975 and 1983, we knew something very special was going on," said Sandra O'Neill, lead author of the new study and a Caltech undergraduate student, in a description of the research onThe regular radio wavelength...
Because of the speed of light, what the scientists are recording has already happened."So the actual collision took place just under 9 billion years ago, but we won't be able to see it on earth for 10,000 years," Readhead said.
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