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That is the "point of no return". Within the event horizon, gravity is so strong that anything that crosses the event horizon can't get out, even if it moves at the speed of light.
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Does a white dwarf have a event horizon?
No. Only a black hole has an event horizon.
What is the shape of black hole?
The event horizon of a black hole is spherical.
What is the length of a black hole?
The diameter is usually considered the diameter of the event horizon. The diameter of this event horizon is directly proportional to the black hole's mass. More information at http://en.wikipedia.org/wiki/Schwarzschild_radiusThe diameter is usually considered the diameter of the event horizon. The diameter of this event horizon is directly proportional to the black hole's mass. More information at http://en.wikipedia.org/wiki/Schwarzschild_radiusThe diameter is usually considered the diameter of the event horizon. The diameter of this event horizon is directly proportional to the black hole's mass. More information at http://en.wikipedia.org/wiki/Schwarzschild_radiusThe diameter is usually considered the diameter of the event horizon. The diameter of this event horizon is directly proportional to the black hole's mass. More information at http://en.wikipedia.org/wiki/Schwarzschild_radius
What planet has a event horizon?
No planet has an event horizon. A black hole has an event horizon; it is the radius within which light cannot escape.
What is the difference between a black hole's photon sphere and its event horizon?
The photon sphere is a sphere above the event horizon in which light orbits the black hole.
What star has an event horizon?
That refers to a black hole - but a black hole is not exactly a star.
What is a black hole's boundary?
its called the event horizon
What is the place of no return?
The event horizon of a black hole.
How big is the event horizon of a 100-solar-mass black hole?
A black hole of 100 solar masses would have an event horizon 185.3 miles in radius.
How big do event horizons get?
Assuming you mean the event horizon of a black hole (there are other types as well), the diameter of a black hole as measured by its event horizon is directly proportional to its mass. The larger the mass, the larger the diameter. Thus, as a black hole's mass increases, it will get bigger. The only limitation is how much mass a black hole is able to incorporate from its surroundings.
What are the two parts of the black hole?
The two parts of a black hole are the event horizon and the singularity. The event horizon is the "surface" of the black hole, and is imaginary. The event horizon's appearance is caused by the bending of light. The singularity is a point of space where everything that gets sucked in is crushed to about the size of an atom.
Is there any other black hole gravity apart from the event horizon?
Gravity is towards the center of the black hole. The event horizon is not what attracts objects - it is simply the "point of no return".
