A star's last stage depends on its initial mass. Here are some possibilities:

* For low-mass stars (like our Sun): They become white dwarfs. These are dense, hot, and slowly cooling remnants of the star's core.

* For medium-mass stars: They go through a supernova explosion, leaving behind a neutron star - a very dense object composed mostly of neutrons.

* For high-mass stars: They also go through a supernova, but leave behind a black hole - a region of spacetime with gravity so strong that nothing, not even light, can escape.

So, it depends on the star's initial mass!