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ExactCollege3 OP t1_irhkxfs wrote

Reply to comment by kuriteru in Can an object that’s not a black hole be so dense or massive that it has an event horizon? by ExactCollege3

But the Swarzchild radius increases with mass linearly, while the radius of a circular body only increases with the cube root of mass, so could a neutron star get big enough to overcome the swarzchild radius without collapsing into a singularity? What is collapsing and when does it happen? How do we know if it’s a singularity?

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kuriteru t1_iri7yns wrote

Its more about density than just mass, every mass has S radius that it tips over into blackhole territory but will not trap light before that point.

Only singularities can warp space time enough to trap light making a blackhole it also doesn't help that we lack the math to fully explain blackholes entirely, all values involved end at either 0 or infinite or some impossible arithmetic involving the two extremes

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Gprime5 t1_irl6jjr wrote

You don't really need the density either.

If you had enough air at standard Earth atmospheric density, then that would create a black hole.

The calculation works out that 3.8 Billion kg of air at standard Earth density will form a black hole.

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ccdy t1_irj3um8 wrote

Neutron stars, like other astronomical bodies made of degenerate matter, shrink in radius as their mass increases.

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