When the core has more than 1.4 solar masses, electron degeneracy pressure cannot support the weight, and the result is a neutron star , which is supported by neutron degeneracy pressure. For such masses, neutron degeneracy pressure cannot support the weight and, furthermore, there is no state of matter which can support the weight. The only possible result is a black hole . To understand a black hole, it is first necessary to understand the idea of escape velocity . The escape velocity is the velocity required for an object to escape the gravitational field of an astronomical object, such as the earth, the sun, a neutron star or anything.
Every object has an escape velocity.
The concept of the escape velocity should follow naturally from our understanding of orbital motion. Remember when we talked about orbits, we considered the idea of a cannon firing a projectile from a high mountain. If the projectile velocity is low, it will just fall to the ground. If it is high enough, the projectile will fall at the same rate as the earth curves away from it, and the projectile will be in orbit. If the velocity is somewhat larger than the velocity required for orbital motion, the projectile will escape.