Life+Cycle+of+a+Star


 * //Protostar= Human fetus//**


 * //Fusion Ignition-Main Sequence= Infant through Adulthood//**
 * //Red Giant=Middle Aged//**
 * //White Dwarf/Black Hole=Old age/Death//**









1. Why do smaller stars live longer? Larger stars burn up fuel fast to maintain their size. 2. How long will a medium star live in main sequence phase? As stars undergo fusion they gradually follow the paths indicated by the light blue lines until they reach the end of their Main Sequence phase - indicated by the dark blue line. 3. After a star enters "old age," how long will it still live? It depends on the mass of the star.