The Schwarzchild Radius or quantum radius is the radius of a sphere such that, if all the mass of an object were to be compressed within that sphere, the escape velocity from the surface of the sphere due to its gravity would equal the speed of light, essentially making the object a black hole.For example, if you want to create a black hole the size of a peanut, you would need to crush an object the size of our Earth.
This 4 minute clip brilliantly depicts some known black holes at different scales.
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