Life Cycle of a StarVersion en ligne Label the life cycle of a star par Kristine Vester 1 Dense Region in nebula begins to shrink, warm up, and become a protostar 2 Nebula 3 Star shines as nuclear reactions inside produce light and heat 4 Main-Sequence Star 5 Stars of greater mass expands, cools, and turns red 6 Supergiant 7 Red Giant 8 Star of less mass expands and glows red as it cools 9 Outer layers of gas pull off 10 Hot core will be exposed as white dwarf 11 Planetary Nebula 12 White Dwarf 13 Star cools and reddens 14 White Dwarf Cooling 15 Star stops glowing 16 Black Dwarf 17 Black Hole 18 Supergiant Explodes blasting away outer layers 19 Supernova 20 Core collapses and becomes very dense 21 Neutron Star 22 Core collapses completely and vanishes