Life Cycle of Stars 4-3 The Life cycle of a star depends upon the size (Mass) of the star. Our Sun is an Average size Star.
Stages of a Star’s Life Nebula: Cloud of Gas and Dust Gravity pulls together
Protostar Birth of a Star( The Beginning): Protostar Fusion begins Gravity causes hydrogen fusion
Main Sequence A Star is born Fusion of hydrogen in the core of the star. Gravity = Fusion A stable star
Giant or Super Giant Fusion Greater than Gravity Average Star: Giant Massive: Super Giant (Super-Nova for the largest Stars)
Dwarf, Neutron or Blackhole Fusion ends – Gravity takes over Average Stars: White Dwarfs Largest Stars: Neutron stars Black Holes
Star Types
Star Classes Big, Bright, Hot O B A F G K M Small, Dim, Cool