Re: Spinning?
If a neutron star is rotating too fast it will fly apart, just like everything else in the universe (caveat: black holes excluded from this). Also there is an absolute limiting factor: the angular velocity at the surface of the neutron star cannot exceed the speed of light.
However you are right in one respect; a rotating neutron star can get larger than a non-rotating one before it collapses into a black hole.
The real problem is that we have very little idea what the Equations of State are for a neutron star. These would describe how the matter in a neutron star behaves under all possible conditions, and physicists still cannot define them (its complicated because, under the conditions in the interior of a neutron star, both relativity and quantum mechanics play a role). I suspect that we could find the upper mass limit for a neutron star changing once we can define the Equations of State (or even get a reasonable approximation).
Biting the hand that feeds IT
