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Black Hole Formation

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Posted by Herb S. on April 6, 2002 05:12:30 UTC

As you have indicated, black holes form when very large stars run out of fuel and are no longer able to mauintain pressure to overcome gravity. To become a black hole the star must be large enough so that gravity can overcome other forces which constrain collapse, such as electron pressure (if smaller, it only collapses to a white dwarf). If the elctron pressure is overcome it becomes a neutron star. If the neutron star is large enough so that the star's radius is less than a critical radius, it is a black hole.

The main reason we can't make one is that you need a very large mass (over twice that of the sun).

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