We reviewed the different phases in the evolution of average stars (like our Sun) and stars that are much more massive, say approximately thirty times the mass of the Sun. As in previous classes, we noted that average stars 'burn' for billions of years, go through the red giant phase followed by the (misnomer) planetary nebula phase, and eventually leave behind a glowing ember we call a white dwarf. Much more massive stars burn furiously and deplete their fuel in a matter of millions of years, explode in spectacular supernovae events, and leave behind black holes.