• Question: Are all Black Holes the same size? If they are what size are they usually?

    Asked by capital letter to Miranda on 22 Jun 2015.
    • Photo: Miranda Jackson

      Miranda Jackson answered on 22 Jun 2015:

      The size of a black hole depends on its mass. We consider the size of a black hole to be the size of its event horizon, the radius at which light will not escape. This is also called the Schwartzschild radius, and for a black hole the mass of the sun, this radius is about 3 km, and for one the mass of the Earth, it is only 9mm.

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