Dense Region in nebula begins to shrink, warm up, and become a protostar
Nebula
Star shines as nuclear reactions inside produce light and heat
Main-Sequence Star
Stars of greater mass expands, cools, and turns red
Supergiant
Red Giant
Star of less mass expands and glows red as it cools
Outer layers of gas pull off
Hot core will be exposed as white dwarf
Planetary Nebula
White Dwarf
Star cools and reddens
White Dwarf Cooling
Star stops glowing
Black Dwarf
Black Hole
Supergiant Explodes blasting away outer layers
Supernova
Core collapses and becomes very dense
Neutron Star
Core collapses completely and vanishes