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ukmicky
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Once enough mass in the form of hydrogen has been swallowed up by a black hole why can't 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.ukmicky said:why is a black hole 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.taylaron said:so everything including light can enter a black hole except hydrogen. that doesn't make much sense to me.
enlighten me
russ_watters said: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?cesiumfrog said:...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).
russ_watters said:Is this a peculiarity of supermassive black holes?
russ_watters said: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?
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.Jarle said: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.Chris Hillman said: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".
A blackhole is a region in space with a gravitational pull so strong that nothing, including light, can escape from it. This means that once an object or person enters a blackhole, they cannot escape and it becomes a one way journey.
When an object or person enters a blackhole, they are pulled towards the center of the blackhole and stretched out due to the intense gravitational forces. Eventually, they will reach the singularity, a point of infinite density and zero volume, where they will be crushed into oblivion.
No, nothing can escape a blackhole. The escape velocity, or the speed needed to escape the gravitational pull, of a blackhole is greater than the speed of light. Since nothing can travel faster than the speed of light, nothing can escape a blackhole.
Yes, there are three main types of blackholes: stellar, intermediate, and supermassive. Stellar blackholes are formed from the collapse of a single massive star, intermediate blackholes are larger and less common, and supermassive blackholes are found at the center of most galaxies, including our own Milky Way.
No, it is unlikely that we could survive entering a blackhole. The intense gravitational forces would stretch and crush our bodies, and the extreme conditions would make it impossible for us to survive. Additionally, the technology needed to even get close to a blackhole is currently beyond our capabilities.