White Dwarf:
•supported by electron degeneracy pressure
•typically about the size (diameter) of Earth
•has a mass no greater than 1.4 MSun
•in a binary system, it can explode as a supernova

Neutron Star:
•sometimes appears as a pulsar
•usually has a very strong magnetic field

Black Hole:
•size defined by its Schwarzschild radius
•viewed from afar, time stops at its event horizon