How fast can the iron core collapse inward just before the supernova explosion?

Answer

Up to 70,000 kilometers per second, or about 23% of the speed of light

The inward infall of the iron core is staggering, reaching speeds up to 70,000 kilometers per second, which is approximately 23% of the speed of light.

How fast can the iron core collapse inward just before the supernova explosion?

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