
How are black holes formed?
How Do Black Holes Form?

· Home
· Become a Member
· Carnival of Space
· Contact Us
· Forum
· Guide to Space
· Privacy Policy
· Telescope Guide
· Subscribe
Universe Today
Remove this ad
** How Do Black Holes Form? **
by Shazi Irshad on June 25, 2009
Want to stay on top of all the space news? Follow *@universetoday* on
Twitter
195154main_WRstarBH2
So what’s a black hole? A celestial body with such an intense pull that
nothing, not light, not electromagnetic radiation – nothing can escape
its pull; hence the name *black hole*. It possesses an infinite density and
is a *oneway pathway* because things can go in but cannot escape out. Its
core is termed as *singularity* and the outer boundary is the *event
horizon*, the end point beyond which anything and everything is sucked into
the cosmic whirlpool of infinite density.
But how do blackholes form?
There are many theories to that question.
Most common theory is where a colossal star with a mass of more than *3*
times the Sun’s reaches the end of its life, gets crushed under its own
gravity, leaving behind a compact blackhole.
Let’s see how that intriguing process takes place.
When a gigantic star reaches the final stage of its life and is about to go
supernova (which normally takes billions of years), it spends all the
nuclear fuel by then. So it stops burning and heating up and cannot create
the nuclear energy required to feed the star and let it make a pivotal
balance to support its own gravitational draw against the intense pressures
brewing inside.
Therefore its stability cracks under its own gravity.
The radius of the star shrinks to a critical size, called the
/*Schwarzschild radius*/ and it starts to devour anything and
Source: www.universetoday.com/33454/howdoblackholesform/
Black hole  Wikipedia, the free encyclopedia

** Black hole **
From Wikipedia, the free encyclopedia
Jump to: navigation, search
For other uses, see Black hole (disambiguation).
Page semiprotected
Simulated view of a black hole (center) in front of the Large Magellanic
Cloud. Note the gravitational lensing effect, which produces two enlarged
but highly distorted views of the Cloud. Across the top, the Milky Way disk
appears distorted into an arc.
General relativity
Spacetime curvature.pngG_{\mu \nu} + \Lambda g_{\mu \nu}= {8\pi G\over c^4}
T_{\mu \nu}
Introduction
Mathematical formulation
Resources Â· Tests
Fundamental concepts
Special relativity
Equivalence principle
World line Â· Riemannian geometry
Phenomena
Kepler problem Â· Lenses Â· Waves
Framedragging Â· Geodetic effect
Event horizon Â· Singularity
*Black hole*
Equations
Linearized gravity
PostNewtonian formalism
Einstein field equations
Geodesic equation
Friedmann equations
ADM formalism
BSSN formalism
HamiltonâJacobiâEinstein equation
Advanced theories
KaluzaâKlein
Quantum gravity
Solutions
Schwarzschild
ReissnerâNordstrÃ¶m Â· GÃ¶del
Kerr Â· KerrâNewman
Kasner Â· TaubNUT Â· Milne Â· RobertsonâWalker
ppwave Â· van Stockum dust
Scientists
Einstein Â· Lorentz Â· Hilbert Â· Poincare Â·
Schwarzschild Â· Sitter Â· Reissner Â· NordstrÃ¶m Â·
Weyl Â· Eddington Â· Friedman Â· Milne Â· Zwicky Â·
LemaÃ®tre Â· GÃ¶del Â· Wheeler Â· Robertson Â·
Bardeen Â· Walker Â· Kerr Â· Chandrasekhar Â· Ehlers Â·
Penrose Â· Hawking Â· Taylor Â· Hulse Â· Stockum Â·
Taub Â· Newman Â· Yau Â· Thorne
/others/
Spacetime
Spacetime
Minkowski spacetime
Spacetime diagrams
Spacetime in General relativity
· v
· t
· e
A *black hole* is a region of spacetime from which gravity prevents
anything, including light, from escaping.^[1] 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.
The hole is called "black" because it absorbs all the light that hits the
horizon, reflecting nothing, just like a perfect black body in
thermodynamics.^[2]^[3]Quantum field theory in curved spacetime predicts
that event horizons emit radiation like a black
Source: en.wikipedia.org/wiki/Black_hole
© 20052019 HaveYourSay.org