Black hole definition1/8/2024 ![]() Most of us know about a black hole’s event horizon, which represents the boundary between where an object can theoretically escape from its gravitational pull and where any object will inexorably be drawn into the central singularity, regardless of what it does. ![]() closer and closer to the mass's location, space becomes more severely curved, eventually leading to a location from within which even light cannot escape: the event horizon. ![]() After all, if all the mass and energy inevitably collapses to a singularity, then what do we even mean by size? That’s what Antoine Merval wants to know, writing in to ask,Īn illustration of heavily curved spacetime, outside the event horizon of a black hole. But for the most extreme density objects in the Universe, black holes, something like “size” isn’t necessarily well-defined. Objects that are stable, both microscopically and macroscopically, are described by measurable properties such as mass, volume, electric charge, and spin/angular momentum. there are some properties that remain the same regardless of any uncertainties. While there might be some quantum effects that play a role for objects that are very small - in their energy, position, lifetime, etc. When it comes to the Universe, we frequently characterize objects by examining and reporting on their physical properties. "Size" in this context has many definitions. shadow of a black hole is different from the size of the event horizon, which are both different than the size of the central singularity, which are different still from the path traced out by particles in a stable orbit around the black hole. This illustration shows how photons are bent around a black hole by its gravity.
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