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Black holes are thought to form from stars or other massive objects if and when they collapse from their own gravity to form an object whose density is infinite: in other words, a singularity.
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archive.ncsa.illinois.edu/Cyberia/NumRel/BlackHoleForma...
archive.ncsa.illinois.edu/Cyberia/NumRel/BlackHoleFormation.html
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Black Holes are made when very large stars die. When the star runs out of fuel for nuclear burning in the core it is no longer able ... Their mass seems to be related to properties of the galaxy (specifically the velocity dispersion in the bulge) leading to questions over which formed first - the black hole or the galaxy.
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curious.astro.cornell.edu/question.php?number=349
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Black hole - Wikipedia, the free encyclopedia
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In general relativity, a black hole is a region of space in which the gravitational field is so powerful that nothing, not even light, can escape. The black hole has a one-way surface, called an eve...
en.wikipedia.org/wiki/Black_hole
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Black holes are the evolutionary endpoints of stars at least 10 to 15 times as massive as the Sun. If a star that massive or larger undergoes a supernova explosion, it may leave behind a fairly massive burned out stellar remnant.
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imagine.gsfc.nasa.gov/docs/science/know_l2/black_holes....
imagine.gsfc.nasa.gov/docs/science/know_l2/black_holes.html
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One type of black holes has measured masses ranging from 4 to 15 solar masses, and is believed to be formed during supernova explosions. The after-effects are observed in some X-ray binaries known as black hole candidates.
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imagine.gsfc.nasa.gov/docs/science/know_l1/black_holes....
imagine.gsfc.nasa.gov/docs/science/know_l1/black_holes.html
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How such massive and energetic structures formed so quickly remains a major puzzle for scientists. Mergers of smaller galaxies and their black holes may have played a role. ... Huge Black Holes Formed Quickly After Big Bang ; By Robert Roy Britt; Senior Science Writer; posted: 22 November 2004; 01:26 pm ET;
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www.space.com/scienceastronomy/blackhole_quick_041122.h...
www.space.com/scienceastronomy/blackhole_quick_041122.html
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How such massive and energetic structures formed so quickly remains a major puzzle for scientists. Mergers of smaller galaxies and their black holes may have played a role. Researchers suspect that black hole formation and galaxy development go largely hand-in-hand, but they cannot say which comes first.
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www.cnn.com/2004/TECH/space/11/23/black.holeformation/i...
www.cnn.com/2004/TECH/space/11/23/black.holeformation/index.html
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