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Once enough mass in the form of hydrogen has been swallowed up by a black hole why cant a new nuclear reaction occur within a black hole creating enough of an outward pressure to uncollapsed it.
By definition of black hole. It's not a black hole if something can escape its event horizon.why is a blackhole a one way ride
Pressure contributes to gravity. More pressure = "stronger" black hole.creating enough of an outward pressure to uncollapsed it.
That's not what I said. Once it enters a black hole, the gravity of the black hole crushes it and it is no longer hydrogen.so everything including light can enter a black hole except hydrogen. that doesnt make much sence to me.
enlighten me
This seems like an odd statement. Sure, classical GR predicts all matter in a black hole is pulled into a singularity characterised by infinite density (personally I doubt quantum theories will retain this feature), but the whole black hole (everything encompassed by the event horizon, from an external perspective) can be said to have an arbitrarily low density (given sufficiently high total mass).Black holes are so dense that the neutrons are crushed into something denser still.
How can it have enough mass to be a black hole in a small enough volume to have an event horizon and not have a high density? Is this a peculiarity of supermassive black holes? The event horizon of a typical black hole is much smaller than the radius of the star that it formed from, is it not?...but the whole black hole (everything encompassed by the event horizon, from an external perspective) can be said to have an arbitrarily low density (given sufficiently high total mass).
Guess you could say that.. although I don't know how dense a typical star really is to begin with. And for another fun fact: the sun produces a mere 300W per cubic meter (hence the difficulty in producing useful fusion power at a "human" scale).Is this a peculiarity of supermassive black holes?
Yes.How can it have enough mass to be a black hole in a small enough volume to have an event horizon and not have a high density? Is this a peculiarity of supermassive black holes?
If the density is infinite, how can the black hole have volume then? There is a set amount of mass in a black hole, and if the density is infinite at any volume you use, then the black hole should only be a point!This seems like an odd statement. Sure, classical GR predicts all matter in a black hole is pulled into a singularity characterised by infinite density (personally I doubt quantum theories will retain this feature), but the whole black hole (everything encompassed by the event horizon, from an external perspective) can be said to have an arbitrarily low density (given sufficiently high total mass).
The event horizon does not define the BH itself. The event horizon simply defines where light cannot escape. It could be hundreds or thousands of miles in radius.If the density is infinite, how can the black hole have volume then? There is a set amount of mass in a black hole, and if the density is infinite at any volume you use, then the black hole should only be a point!
Granted, the event horizon is functionally the part we concern ourselves with but this thread is questioning what happens inside the horizon.Oh dear. Actually, it would be more correct to say that the event horizon is the defining characteristic of the notion of a "black hole".