3 ms·
Something I've always wondered about is how do black holes form, specifically? E.g.: Do they grow outward from a point? A true mathematical point, or a tiny by
by jiggawatts 4y ago
Something I've always wondered about is how do black holes form, specifically?
E.g.: Do they grow outward from a point? A true mathematical point, or a tiny by finite highly curved region? Does the matter "fall in", or does the event horizon "expand to encompass the existing matter"? Does the observer's perspective matter? I.e.: is there a scenario where from one frame there is a black hole seen but from another frame it's just very dense stuff?
- consilient 4y ago> Do they grow outward from a point? A true mathematical point, or a tiny by finite highly curved region? The latter, where "tiny" for a stellar black hole is on the order of kilometers. > Does the observer's perspective matter? I.e.: is there a scenario where from one frame there is a black hole seen but from another frame it's just very dense stuff? An outside observer will never actually see light emitted at the moment the black hole forms: the infalling matter will just appear more and more heavily redshifted until it becomes undetectable.