suresh2011:5540 days ago
Aka black hole walata gawa gan epa ushan kenek ahala theba nisa kewe

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WaPaRt:5540 days ago
Black Holes: What Are They?
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. With no outward forces to oppose gravitational forces, the remnant will collapse in on itself The star eventually collapses to the point of zero volume and infinite density, creating what is known as a " singularity ".

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WaPaRt:5540 days ago
As the density increases, the path of light rays emitted from the star are bent and eventually wrapped irrevocably around the star. Any emitted photons are trapped into an orbit by the intense gravitational field;they will never leave it. Because no light escapes after the star reaches this infinite density, it is called a black hole.But contrary to popular myth, a black hole is not a cosmic vacuum cleaner. If our Sun was suddenly replaced with a black hole of the same mass, the only thing that

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WaPaRt:5540 days ago
would change would be the Earth's temperature.To be "sucked" into a black hole, one has to cross inside the Schwarzschild radius. At this radius, the escape speed is equal to the speed of light, and once light passes through, even it cannot escape.The Schwarzschild radius can be calculated using the equation for escape speed.

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WaPaRt:5540 days ago
Vesc = (2GM/R)1/2
For photons, or objects with no mass, we can substitute c (the speed of light) for Vesc and find the Schwarzschild radius, R, to be
R = 2GM/c2

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