When a large star has spent all its nuclear energy it finally contracts due to its own gravity and becomes a d

When a large star has spent all its nuclear energy it finally contracts due to its own gravity and becomes a dense small object called a neutron star. Many such stars are found to be rotating with a high speed. How can you account for this high rate of rotation particularly when most stars like our sun are rotating very slowly?|||Conservation of momentum. If you spin around with your arms outstretched and then bring them to you, you will speed up. Same thing happens with a collapsed star, since the neutron star is so much smaller.