1. Neutron Star: If the core of the star is between 1.4 and 3 solar masses, it will collapse into a neutron star. This is a incredibly dense object, packed with neutrons, with a radius of only about 10 kilometers. Neutron stars have extremely strong magnetic fields and spin rapidly, often emitting radio waves (forming pulsars).
2. Black Hole: If the core of the star is more massive than 3 solar masses, the gravitational collapse will continue beyond the neutron star stage, forming a black hole. A black hole is a region of spacetime where gravity is so strong that nothing, not even light, can escape.
Let me know if you'd like to learn more about either of these fascinating objects!