Reality Check
Penultimate Amazing
Actually that is only true in general.What is the problem here? Compact stars rotate fast, bloated stars rotating slowly: that is only as expected.
The rate of spin of a main sequence star depends on the initial conditions of stellar formation, e.g. the angular momentum of the original gas cloud. It is generally true that the smaller the star, the faster it rotates.
Stars also change their rotation during their life time, e.g. slow down if they bloat into giants, speed up (a lot) if they shrink to white dwarfs.
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