1. Neutron Star: If the star's core is between 1.4 and 3 solar masses, it will collapse into a dense, spinning ball of neutrons called a neutron star. These objects are incredibly small (about 12 miles in diameter) but incredibly dense, packing the mass of the sun into that tiny space.
2. Black Hole: If the core's mass exceeds about 3 solar masses, it will collapse further, its gravity overcoming all other forces, and form a black hole. A black hole is a region of spacetime where gravity is so strong that nothing, not even light, can escape.