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FreshEclairs t1_j26e8af wrote

Reply to comment by playadefaro in How fast does the Milky Way spin? How far does Earth move through space in a year? by Sabre-Tooth-Monkey

Neutron stars have a tremendous amount of mass crunched as densely as imaginable, and all that rotational momentum adds up.

The fastest spinning neutron star has an estimated surface speed of about 0.25c, or 25% the speed of light.

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