The size of the event horizon is proportional to the mass. The choices are: stellar-mass black hole, intermediate-mass black hole, supermassive black hole, or, perhaps, primordial black hole. For example, if a star with a mass of 6 solar masses collapses to form a black hole, then the black hole is a 6-solar-mass black hole. Thank you, but what is making that diference between sizes of event horizons (we have got super massive black holes, smaller blackholes? I mean how is possible that one blackhole is smaller than the other or bigger when singularity is just infinite in size and mass ?ĭifferent black holes have singularities containing different amounts of mass.
When people talk about the radius of a black hole, they usually mean the radius of the event horizon. The predicted size of the shadow cast by the event horizon of the supermassive black hole at the center of our own Milky Way is about 50 microarcseconds. You can think of the singularity as the place where all the in-falling matter accumulated. A black hole can be formed by the death of a massive star. In the real relativistic theory, it's boundary that no cause-and-effect relationships can cross from the inside out.īlack holes form by the gravitational collapse of massive bodies. black hole, cosmic body of extremely intense gravity from which nothing, not even light, can escape. Using a rough Newtonian analogy, the event horizon is like the surface from which the escape velocity exceeds the speed of light. Most people visualize the singularity as a point at the center of the sphere, and although that's not quite rigorously right, it's good enough for the purposes of the present discussion. Most famously, black holes were predicted by Einsteins theory of general relativity, which showed that when a massive star dies, it leaves behind a small, dense remnant core. The event horizon is a sphere with a certain radius.
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