Calculating how smal something must be to collapse into a black hole.
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Anonymous2006-04-07 15:15
A star has to be *large* enough to collapse into a black hole, other wise it explodes and then turns into a neutron star, a high density star that has enormous gravity, but nowhere near the amount of a black hole. A star has to be massive to become a black hole, perhaps a large blue or large red star, because in order for a black hole to form, massive amounts of matter have to be "compressed" into a small area.
As for entering a black hole, anything can enter it, it's getting out that's the hard part. After entering the black hole it's theorized that matter is stretched to an infinitely small "strand" of matter. Gettting out of the black hole is feat reserved for the matter that makes up the black hole itself.