*except Hawking radiation if I understand correctly, but I doubt it transfers information about the hole's mass.
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This is highly debated. Gravity waves, however, do seem to move at c, sadly.
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Gravity waves are insanely hard to detect too, & we have little idea if detections are related to visible star observations.
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The thing is though, you literally have to suddenly destroy mass to get a jump in gravity to detect. And that's rare.
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It is also, fortunately, very far away!
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I'm not that current though. Could be I'm out of date with latest research.
End of conversation
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