what do we mean by the event horizon of a black hole?

As the eminent American physicist Kip Thorne describes it, it is "the point where all laws of physics break down".

We have not yet directly imaged the black hole there, but the Event Horizon Telescope, from 25,000 light years away, aims to change that. It is the "bottomless pit" of the black hole. It is the boundary within which events in the black hole cannot influence events in the outside universe. The black hole event horizon is teleological in nature, meaning that we need to know the entire future space-time of the universe to determine the current location of the horizon… It is the center of the black hole. The Event Horizon Telescope is tackling one of the largest cosmological challenges ever undertaken: Take an image of the supermassive black hole at the center of our galaxy, using a telescope the size of the Earth. The ‘event horizon’ is the boundary defining the region of space around a black hole from which nothing (not even light) can escape.In other words, the escape velocity for an object within the event horizon exceeds the speed of light.The name arises since it is impossible to observe any event taking place inside it – it is a horizon beyond which we cannot see. SciFri Extra: Picturing A Black Hole. It is the place where time begins to slow down as you approach a black hole. The radial coordinate (which loosely describes the distance to the singularity at the center of the black hole) becomes "time-like" while the coordinate time becomes "space-like"; as a result, an object (or indeed, a photon) within the event horizon can no more avoid the singularity than an outside observer could avoid next Tuesday. That is, at this border also called "point of no return" , nothing can escape (not even light) and no event that occurs within it can be seen from outside.

In the center of a black hole is a gravitational singularity, a one-dimensional point which contains a huge mass in an infinitely small space, where density and gravity become infinite and space-time curves infinitely, and where the laws of physics as we know them cease to operate.

“The [material] around the black hole is transparent to radio waves, so we can see through all the hot gas trying to get through the event horizon,” Doeleman says. X-ray: NASA/UMass/D.Wang et al., IR: NASA/STScI Now, the Event Horizon team has announced they have big news to share about those efforts. What do we mean by the event horizon of a black hole? The event horizon is … We basically understand what happens outside the black hole as you approach its event horizon, that infamous point of no return. And since black holes are my area of interest (with Quasars), I am happy to answer your question. The event horizon is the surface of a black hole, it is the border of space-time in which the events on one side of it can not affect an observer on the other side. Very simply, a black hole is comprised of several parts, and in order for one part to make sense, we need to view it in relation to the whole.

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