Per 
SCP idea-a nearby star will collapse until it becomes a white dwarf, at this point the Pauli exclusion principle keeps the electrons in the star far enough apart to resist further collapse - this energy is called 'electron degeneracy'.
Stars greater than 1.4 times the mass of the Sun (called the Chandrasekhar limit after the Indian physicist who discovered it on his way to England) will tend to explode in a supernova casting off much of their mass. A small central core will remain and like smaller stars this will collapse only this time electron degeneracy will not be enough to support the star's mass against its gravitational collapse and it will continue to shrink until it becomes a tiny, but hugely massive, neutron star held together by neutron degeneracy.
If neutron degeneracy is not enough to resist the star's collapse it will continue to shrink until the matter is all compressed into an infinitely small, infinitely dense point called a singularity. This is the centre of a black hole.
The Pauli exclusion principle, in VERY layman's terms, means that no 2 particles with mass (outside of bonsons and other light particles) can be in the same place at the same time with the same configuration, meaning that the degeneration is halted by simply mass not being able to merge with other mass.
The idea goes that the nearby star's white dwarfism exploded into a small central core, which has been hurtled towards earth by the residual force of the supernova explosion. The foundation saw this
