A medium-sized star is rotating about its axis (similar to how the earth rotates about its axis once each day). At the end of its life, it collapses into something called a neutron star which has a much smaller radius than the original star. In the process, there are no external forces on the star. Additionally, most of the mass remains with the star as it collapses. Considering conservation of angular momentum, we would expect the rotation speed of the star to .