A black hole is an object — typically a collapsed star — whose gravity is so strong that its escape velocity exceeds the speed of light. Since nothing is known to exceed the speed of light, nothing can escape from a black hole.
A black hole is defined by the escape velocity that would have to be attained to escape from the gravitational pull exerted upon an object. For example, the escape velocity of earth is equal to 11 km/s. Anything that wants to escape earth's gravitational pull must go at least 11 km/s, no matter what the thing is — a rocket ship or a baseball. The escape velocity of an object depends on how compact it is; that is, the ratio of its mass to radius. A black hole is an object so compact that, within a certain distance of it, even the speed of light is not fast enough to escape.
this link below is amazing to understand black hole.
http://amazing-space.stsci.edu/resources/explorations/blackholes/lesson/index.html
3 comments:
sir can you also explain something about wormwholes?
-Tanya
In physics, worm holes are like a shortcut through spacetime. You must be knowing about time-bends...(as we are in the same house for technocrat doing TIME TRAVEL)...The impossibility of faster-than-light relative speed only applies locally. Wormholes allow faster than light travel by ensuring that the speed of light is not exceeded locally at any time. While traveling through a wormhole, subluminal (slower-than-light) speeds are used. If two points are connected by a wormhole, the time taken to traverse it would be less than the time it would take a light beam to make the journey if it took a path through the space outside the wormhole. However, a light beam traveling through the wormhole would always beat the traveler. As an analogy, running around to the opposite side of a mountain at maximum speed may take longer than walking through a tunnel crossing it.
ok...
thanks, i guess
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