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It seems you are referring not to any collapsed star, but a black hole. The "event horizon" is the area from which nothing can escape.

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Q: What is the sphere around a collapsed star from which light can not merge called?
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What is the sphere around a collapsed star from which light can not emerge called?

That refers specifically to black holes (there are other types of "collapsed stars"). This sphere is called the "event horizon".


Can you make light circular?

Only around a black hole. There is a sphere around every black hole where light orbits the black hole.


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Can you get a light sphere in Pokemon platinum if so where?

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Why in coulomb's law for charges force is inversely proportional to square of distance between charges?

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What is a collapsed star from which light cannot escape?

A black hole.


What is the name for the suns sphere of light?

The photosphere.


What is the name of the suns sphere of light?

The photosphere.


What kind of star is invisible?

Black holes are invisible because their gravity well pulls in any light around it, but technically they're not stars. They are the collapsed cores of stars.


What round sphere does not give off light?

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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 is created when light is blocked?

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