Black Holes
Just like white dwarfs
(Chandrasekhar limit: 1.4 Msun), there is a mass limit for
neutron stars:
Neutron stars can not
exist with masses > 3 Msun
We know of no mechanism
to halt the collapse of a compact object with > 3 Msun.
It will collapse into a single point – a singularity:
=> A black hole!
