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Cosmic Queries – Planck Lengths to Supermassive Black Holes with Matt O’Dowd
StarTalk Radio
Birth of Event Horizon and Black Holes
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Black holes are formed by collapsing cores of massive stars, where a neutron star may turn into a black hole if it is large enough. The virtual event horizon within the neutron star expands until it meets the surface and forms a black hole with an escape velocity equal to the speed of light. The size of a black hole's event horizon is crucial to determine its formation, and it grows as the neutron star shrinks. Earth theoretically has a similar virtual event horizon, with a diameter comparable to that of a plum if it were a black hole.
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