Black Holes
Another final result of a supernova explosion is a black hole, but this would only happen if the remnants of stars is greater than three solar masses apparently collapse into objects even smaller and denser than neutron stars.
Black Holes
An object with such powerful gravity that nothing can escape from it, including light. The black hole's mass is concentrated in a point of almost infinite density called a singularity.
Black Holes
Simulation
A black hole is a star that has collapsed into a tiny point known as a singularity. It is so dense that it sucks in everything near it, including light.
Black Holes
A spiral-shaped disk of dust fueling a massive black hole in the center of the galaxy NGC 4261.
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L. Ferrarese (Johns Hopkins University) and NASA.
Black holes
Black holes are peculiar objects with many strange properties, but most books and articles have emphasised their exotic aspects, and obscured their fundamentally simple nature.
Black Holes
A black hole is not an empty hole in space but looks like one because it gives out no light. It is in fact an area where gravity is so strong that nothing, not even light, can escape from it.
Black Hole
Related Category: Astronomy: General
in astronomy, celestial object of such extremely intense gravity that it attracts everything near it and in some instances prevents everything, including light, from escaping.
BLACK HOLES
The Death of Giant Stars
A black hole is a massive object (or region) in space that is so dense that within a certain radius (the Schwarzschild radius, which determines the event horizon), ...
Black Hole
A black hole is a region of space within which the force of gravity is so strong that nothing, not even light, can escape.
Black Hole
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Artist concept of a black hole. Credit: Tel Aviv University ...
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Black holes
The problem with primordial black holes is that we don't even know if they exist, or whether they could survive for long.
Black hole
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Black Holes
Members of a certain class of physical objects have a property known as the Schwarzschild radius. This class of objects includes (or is entirely occupied by - not sure) stars.
Black Hole :
Black hole is cosmic body of extremely intense gravity from which nothing, not even light, can escape. A black hole is formed when matter ungoes extreme pressures, such as the death of a massive star.
Black Holes
A black hole can be formed in the manner described above, but also in two other ways. The first is that if a star has more than nine solar masses when it goes supernova, then it will collapse into a black hole.
Black Holes: What Are They?
Black holes are the evolutionary endpoints of stars at least 10 to 15 times as massive as the Sun.
black holes
space definitions
Definition: Black Hole: Astronomy theoretical celestial object, formed when a massive star collapses from its own gravity. A black hole has such a strong pull of gravity that not even light can escape from it.
BLACK HOLES
A is a massive object (or region) in space that is so dense that within a certain radius (the , which determines the ), its gravitational field does not let anything escape from it, not even light.
Black holes and science fiction A concept as bizarre as a black hole naturally attracts the interest and creativity of science fiction writers. A favorite theme is the use of a black hole as a path to elsewhere or else when in the universe.
Black hole
Wikipedia, the free encyclopedia - Cite This Source
A black hole is a region of space in which the gravitational field is so powerful that nothing can escape after having fallen past the event horizon.
Black Holes
Guess what?
Some scientists believe that there is a black hole here in our very own Milky Way.
Black Holes
The neutron star is similar to the white dwarf: it is a massive, compact star that is supported entirely by the pressure coming from tightly packed elementary particles.
Black holes
Now if you remember about white dwarfs, they are electron degenerate and they have an upper mass limit (the highest mass that they can have without collapsing in on themselves).
If Black Holes Are "Black," How Do Scientists Know They Are There?
A black hole can not be seen because strong gravity pulls all of the light into the middle of the black hole.
So is this black hole what holds our galaxy together? Probably not. If it did, then the motion of stars around it would slow down with increasing distance, in accordance with Kepler's third law.
A black hole concept drawing by NASA
A primordial black hole is a hypothetical type of black hole that is formed not by the gravitational collapse of a star but by the extreme density of matter present during the universe's early expansion.
Supermassive black holes at the hearts of active galaxies swallow large amounts of gas. During this feast they spill a lot of their "food," which is discharged in turbulent outbursts.
Timeline of black hole physics
Timeline of black hole physics ...
BLACK HOLE
BLACK HOLE, concept in the study of gravitation. The gravitational field of a black hole, which is an extremely dense body, is so strong that, if the body is large enough, nothing, including electromagnetic radiation, ...
BLACK HOLES IN BINARY SYSTEMS
A much better way to find black holes is to look for their effects on other objects. Our galaxy harbors many binary-star systems in which only one object can be seen.
Black Holes
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black hole
a region of space where gravity is so powerful that not even light can escape; black holes can form either from the death of high-mass stars or in the cores of galaxies
black holes ...
black hole
An object whose gravity is so strong that not even light can escape from it.
black-hole dynamic laws; laws of black-hole dynamics ...
Black Hole: An object with such high gravity that not even light can escape. These may be formed when the most massive of stars die, and their cores collapse into a superdense mass.
Black Hole
A mass that has collapsed to such a small volume that its gravity prevents the escape of all radiation; also, the volume of space from which the radiation may not escape.
Blue and Red Shifts ...
black hole
An incredibly dense object whose gravity is so strong that not even light can escape from it. Black holes warp space and time around them.
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BLACK HOLE - Maximally gravitationally collapsed object predicted to exist by the theory of general relativity, from which no material object, light or signal of any kind can escape.
Black Hole
the collapsed core of a massive star. Stars that are very massive will collapse under their own gravity when their fuel is exhausted.
Black Hole - A region of space from which no matter or radiation can escape. A black hole is a result of the extreme curvature of space by a massive compact body
Blackbody - An object that is a perfect absorber of radiation falling on it ...
Black Hole. A volume of space in which gravity is so intense that nothing can escape, not even light.
Black Holes
So far we have seen what happens to stellar remnants of about 3 solar masses or less. Remnants less than 1.4 solar masses become white dwarfs and will eventually cool down to black spheres of electron degenerate matter. Cores of 1.
Mini Black Holes: The black hole formation discussed so far can only produce black holes with mass greater than about 3 solar masses.
[edit] Black holes
Main article: Black hole
If the mass of the stellar remnant is high enough, the neutron degeneracy pressure will be insufficient to prevent collapse below the Schwarzschild radius. The stellar remnant thus becomes a black hole.
Black Hole
A region of space containing a huge amount of mass compacted into an extremely small volume. A black hole's gravitational influence is so strong that nothing, not even light, can escape its grasp.
black hole: a concentration of mass so dense that nothing, not even light, can escape its gravitational pull once swallowed up. Many galaxies, including the Milky Way, have super-massive black holes at their centers.
black holes A dense, compact object whose gravitational pull is so strong that - within a certain distance of it - nothing can escape, not even light.
Black Hole
The thing that big stars become after they die. Black holes have very strong gravity - not even light escapes!
C ...
Black hole: Extremely dense remnant of a very massive star. Its gravitational attraction is so strong that light cannot escape from it.
Black hole A region of space where matter has been collapsed to the point where gravity is so strong that nothing, not even light, entering that area of space can escape.
More about black holes...
Black Hole
A region of space around a very small and extremely massive object within which the gravitational field is so strong that not even light can escape.
Bolide ...
Black holes are also collapsed dead stars, yet they are so dense that even light cannot escape from their gravitational pull. Rigel, being a blue giant will likely, one day, collapse into one of these types of objects.
Black hole
In general relativity, a black hole is a region of space in which the gravitational field is so powerful that nothing, including electromagnetic radiation , can escape its pull after having fallen past its event horizon....
s), ...
black hole - (n.)
An object that has collapsed under its own gravitation to such a small radius that its gravitational force traps photons of light.
Bode's law - (n.) ...
Black Holes - A Traveler's Guide by Clifford A. Pickover gives the reader a chance to "play" with black holes by using simply mathematics.
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Black holes have very interesting properties. Suppose Alice sends a robot named Robby on a spaceship to investigate a black hole.
Black holes endowed with the maximal amount of force charge possible for a given total mass. [G99]
Extrinsic ...
Black holes might seem to be very complicated beasts, since they have so many strange properties. But actually they are remarkably simple.
Taylor, J. G. Black Holes--The End of the Universe? New York: Random House, 1977.
Welfare, S. and Fairley, J. New York: A & W Publishers, 1980.
Wick and Isaacs, J. D. "Tunguska Event Revisited." Nature 247, 139, 1974.
AGN without black holes?
Occam's Razor has driven many people to conceive alternate schemes for AGN energy production, though most end up no less extreme than a massive black hole.
 See also: Light, Energy, Universe, Star, Earth
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