What is black hole?

  • (noun): A region of space resulting from the collapse of a star; extremely high gravitational field.

Black Hole

A black hole is a region of spacetime where gravity prevents anything, including light, from escaping. The theory of general relativity predicts that a sufficiently compact mass will deform spacetime to form a black hole. Around a black hole there is a mathematically defined surface called an event horizon that marks the point of no return. It is called "black" because it absorbs all the light that hits the horizon, reflecting nothing, just like a perfect black body in thermodynamics. Quantum mechanics predicts that event horizons emit radiation like a black body with a finite temperature. This temperature is inversely proportional to the mass of the black hole, making it difficult to observe this radiation for black holes of stellar mass or greater.

Read more about Black Hole.

Some articles on black hole:

Spin-flip
... A black hole spin-flip occurs when the spin axis of a rotating black hole undergoes a sudden change in orientation due to absorption of a second (smaller) black hole ... consequence of galaxy mergers, when two supermassive black holes form a bound pair at the center of the merged galaxy and coalesce after emitting gravitational waves ... since a number of physical processes are associated with black hole spins for instance, jets in active galaxies are believed to be launched parallel to the spin axes of ...
Safety Of Particle Collisions At The Large Hadron Collider - Large Hadron Collider - Safety Reviews - Other Publications
... implications of hypothetical stable TeV-scale black holes", where they develop arguments to exclude any risk of dangerous black hole production at the LHC ... On 9 February 2009, a paper titled "Exclusion of black hole disaster scenarios at the LHC" was published in the journal Physics Letters B ... proofs aimed at ruling out any possible black hole disaster at the LHC, relies on a number of new safety arguments as well as certain arguments already ...
Black Hole - Open Questions - Information Loss Paradox
... List of unsolved problems in physics Is physical information lost in black holes? Because a black hole has only a few internal parameters, most of the information about the matter that went into forming the black ... It does not matter if it is formed from television sets or chairs, in the end the black hole only remembers the total mass, charge, and angular momentum ... As long as black holes were thought to persist forever this information loss is not that problematic, as the information can be thought of as existing inside the black hole, unaccessible from the outside ...
Super Turrican 2 - Story
... small star system floating in the endless spiral arms of a black hole ... Ready to face their final challenge, the ships prepare to enter a black hole in order to reach the attacked system ... later, only one of the ships manage to escape the dangerous influence of the black hole ...
Superman (Kingdom Come) - Fictional Character Biography - Justice Society of America
... portal created inadvertently by Starman when he opened a black hole to stop a raging mystical fire the Justice Society couldn't contain that was coming from the hole in the chest ... Starman creates a black hole and places Goth inside of it ... Goth's powers harmlessly erupt in the black hole, causing a rip in the dimension which brought this Superman to New Earth ...

Famous quotes containing the words hole and/or black:

    It was a blonde. A blonde to make a bishop kick a hole in a stained-glass window.
    Raymond Chandler (1888–1959)

    O God, oh! of thine only worthy blood,
    And my tears, make a heavenly Lethean flood,
    And drown in it my sins’ black memory.
    That thou remember them, some claim as debt;
    I think it mercy, if thou wilt forget.
    John Donne (1572–1631)