If the speed of gravity is the speed of light, how can someone outside of a black hole detect its change of mass?
AbouBenAdhem @ AbouBenAdhem @lemmy.world Posts 8Comments 1,568Joined 2 yr. ago
AbouBenAdhem @ AbouBenAdhem @lemmy.world
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You only know the total mass, charge, and angular momentum of the black hole—you don’t know how those properties are distributed inside the event horizon. You see the apple approach the horizon and the horizon expands to encompass the apple-black hole system, but that information isn’t coming from the singularity at the center—it’s coming from the horizon.