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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What is a black hole? ... If a black hole existed, would it suck up all the matter in the Universe? ... By the way, this time scales with the size of the black hole, so if you'd jumped into a smaller black hole, your time of death would be that much sooner.
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cosmology.berkeley.edu/Education/BHfaq.html
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Since stellar black holes are small (only a few to a few tens of kilometers in size), and light that would allow us to see them cannot escape, a black hole floating alone in space would be hard, if not impossible, to see.
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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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Table: The size of some objects when crushed to black hole size. This numbers need to be redone; I am including them from memory. Notice that an atom has a diameter of about . A person-mass black hole has smaller than 10-20, which is as much smaller than an atom than an atom is smaller than a person.
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www.mcm.edu/~christej/S01P1420/Classnotes/node10.html
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There is no "average" mass for black holes throughout the entire universe. Black holes range greatly in mass, depending on how they were formed, and how long they have existed if you take Hawking Radiation into account. Mass can b...
http://wiki.answers.com/Q/What_is_the_average_size_of_a...
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The survey revealed that a black hole's size is dependent on the mass of its host galaxy's bulge, a spherical region in the center of a galaxy consisting of stars. Monstrous galaxies, for example, have titanic black holes.
http://www.space.com/scienceastronomy/hubble_trivia_040...
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Astronomers discover possible middleweight black hole. ... A new discovery of a middleweight black hole suggests black holes come in all sizes. ... Mid-Size Black Hole Answers Longstanding Question ; By Jeanna Bryner; Staff Writer; posted: 02 April 2008; 11:25 am ET;
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www.space.com/scienceastronomy/080402-medium-black-hole...
www.space.com/scienceastronomy/080402-medium-black-holes.html
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SCIENCE REPORT - New Size Black Hole ... Black holes are objects of such great mass that nothing can escape their gravity, including light. American astronomers found the new size black hole in a galaxy ten-million light years from Earth. The galaxy is called M-Eighty-Two.
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www.manythings.org/voa/00/001005sr_t.htm
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