What Happens to Stars Much Heavier Than The Sun?
STAGE 4a: Neutron Star
After the supernova blast blows off the outer layers of the star, all that is left is the central core. The core now contains a mass between 1.4 and 3.0 times the sun's mass but condensed into a volume 10- to 20- km across - roughly the size of a small town on Earth.
The matter in a neutron star would be incredible to behold. It is thought to be no longer gaseous. The surface may be crystalline.
Densities are a trillion times greater than those in a white dwarf. In fact, it is so dense that one teaspoonfull would outweigh the Empire State Building.