What is the ultimate remnant left behind after a Sun-like star exhausts its fuel supply at the end of the giant phase?

Answer

A hot, dense white dwarf core

For Sun-like stars, after the red giant phase ends and outer layers drift away forming a planetary nebula, the remaining core is a hot, dense white dwarf which eventually cools into a black dwarf.

What is the ultimate remnant left behind after a Sun-like star exhausts its fuel supply at the end of the giant phase?

#Videos

What Causes a Red Giant's Surface to Cool? - YouTube

starsstellar evolutionastrophysicsred giantscooling