The so-called "event horizon" of a black hole is the point-of-no-return. That means that anything that gets inside the event horizon can't get out any more, even if if it moves at the speed of light.
The event horizon of a black hole is spherical.
The apparent horizon is formed first in the evolution of a black hole. It represents the point from which no light can escape, defining the boundary of a black hole's event horizon.
That refers to a black hole - but a black hole is not exactly a star.
The photon sphere of a black hole is a region where light can orbit the black hole before being pulled in, while the event horizon is the point of no return where nothing, not even light, can escape the black hole's gravitational pull. The photon sphere is closer to the black hole than the event horizon.
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.
An "event horizon." This is the range from the black hole at which not even light can escape the pull of gravity. If the black hole is low-mass, this will be sharp, but the horizon of a supermassive black hole might have stars, worlds and people inside going on about their business. However, none of this could be known to anyone outside the horizon.
A black hole's photon sphere is the region around the black hole where photons can orbit in a stable circular path. The event horizon is the boundary beyond which nothing, not even light, can escape the gravitational pull of the black hole. In simpler terms, the photon sphere is where light can circle the black hole before falling in, while the event horizon marks the point of no return.
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
if there is light surrounding a black hole it is normally from material entering into the event horizon of the black hole.
The event horizon of a black hole is directly related to its mass. For a 100 solar mass black hole, the event horizon radius would be about 295 kilometers (183 miles). This is the point of no return beyond which nothing, not even light, can escape the black hole's gravitational pull.
its called the event horizon
The event horizon of a black hole.