- #1
Albertgauss
Gold Member
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- 37
Surprisingly, I have not been able to find an answer to this question. How did scientists know where to build LIGO so that it would be able to find merging black holes in the sky? I assume LIGO is a permanent instrument so that it cannot be pointed to various parts of the sky, like an ordinary telescope would. Thus, fixed to the Earth, it would have to rotate with the Earth and hope that in whatever sky it happened to slice to at the right time would have merging black holes contained within the appropriate sky-patch. Was there some other way to know where the black holes merging would be and then the scientists built LIGO on the right steradian of Earth? Without LIGO up and running, there would be no way to know where merging black holes would be unless there is a binary star or space dust producing gamma rays nearby, etc.