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When a large red giant star collapses into a neutron star, how fast does the collapse occur?
Say a red giant is about 1 AU in diameter.
I have heard that this happens in less than a second for a large red giant. Is that true?
I meant 1 AU in radius, not diameter.
Like the first poster said, nobody knows for sure. On the other hand, less than a second sounds suspicous. 1 AU is eight light minutes. Collapsing in less than eight minutes means going faster than the speed of light. I wouldn't even expect a black hole to do that trick. Also, a red giant is so big because the center is so hot. Even after it runs out of fuel, it will take a while for that heat to leave (radiate). My uneducated guess would be that it would take a least a few days.
Red Orchestra: Ostfront 41-45 Large Trailer