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Recently, the event horizon of the black hole at the center of M87 was directly imaged by the EHT.

My college professor said this could serve as another test of the accuracy of general relativity. How does the observation test the GR, in detail? And compared with the test of LIGO?

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  • $\begingroup$ GR can explain why the image looks like what you saw in the picture, it explains quantitatively how light emitted by the hot accretion disk that orbits the black hold is bent around the black hole to give you that weird ring around it. Computer simulations of BH using GR produce images that are identical to what you see the real image. The prediction that GR gives to the image is a fine test. LIGO tested other predictions of Einstein’s equations, gravitational waves. Do you want me to expand this explanation with images and intuition or do you feel like you need something more mathematical? $\endgroup$ – PedroDM Aug 3 at 5:35
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My college professor said this could serve as another test of the accuracy of general relativity

Given that GR has already been tested to some ungodly precision, I think the answer is "it can't".

I mean, you can say that it proves that GR is right about BH's, and you could say that's a test of GR, and maybe that's "the accuracy" he's referring to.

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