2007-07-20 07:37:08 · 6 answers · asked by Alexander 6 in Science & Mathematics ➔ Physics
Once again a bunch of wrong answers. Initially radiation pressure will keep a star from collapsing. When gravity and radiation pressure are equal (as with a star) it is said to be in hydrostatic equilibrium. After nuclear fusion ends there is no radiation pressure to support the star so it collapses. At this point electron degeneracy pressure keeps objects like white dwarfs from collapsing (from QM and Pauli). If mass continues to accumulate then neutron degeneracy pressure will support the object (neutron star). If the mass gets too high for neutron degeneracy pressure to support it then nothing can stop if from forming a black hole, there are no physical mechanisms beyond neutron degeneracy pressure to support the object, hence there is a gravitational runaway and thus a black hole. Einstein solved these equations but thought that they were just mathematical anomalies, that something must stop black holes from forming, turns out he was wrong.
2007-07-20 07:54:38 · answer #1 · answered by mistofolese 3 · 4⤊ 0⤋
The nuclear reactions going on in the star push material outwards. Even without that force, a star may not form a black hole. It depends on the mass of the star and a few other factors.
2007-07-20 07:48:40 · answer #2 · answered by Michael C 7 · 1⤊ 0⤋
Momentum.
Another possible answer (if you are talking about stars BECOMING black holes) is the fact that they have not reached critical mass.
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2007-07-20 08:12:01 · answer #3 · answered by Anonymous · 0⤊ 3⤋
heat and size/ rotation if they are cool enough or slow enough and big enough they will form a black hole.
ie cirfugal force, and energy are the only things that stop a massive star from forming a black hole
2007-07-20 07:42:39 · answer #4 · answered by first_gholam 4 · 0⤊ 3⤋
GOD
the same force that keeps the earth suspended in space and time
2007-07-20 07:48:32 · answer #5 · answered by Lisa 6 · 1⤊ 5⤋
They still have fuel to burn.
2007-07-20 07:44:25 · answer #6 · answered by Steel Rain 7 · 1⤊ 2⤋