Assertion: black hole's surface | /r/Synonym | the event horizon
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text: A black hole is therefore bounded by a well-defined surface or edge known as the “event horizon”, within which nothing can be seen and nothing can escape, because the necessary escape velocity would equal or exceed the speed of light (a physical impossibility).
text: According to Nasa, “as a star collapses…as the surface of the star nears an imaginary surface called the event horizon, time on the star slows to relative to the time kept by observers far away” and, as the surface reaches this event horizon, the star becomes stuck in time as a “frozen collapsing object” from the point of view of the observers (science.nasa.gov).
text: A black hole has a defined surface known as the “event horizon” which marks the point of no return.