Life history of a star

• Protostar = a dense ball of gas and dust that is hot enough for nuclear fusion.
• Main sequence Star= a star that is in the stable main sequence of nuclear fusion
• In a main sequence star makes elements up to iron form the helium
• The forming of a supernova creates larger elements than iron and then scatters them when it bursts
• Life Cycle of a Star:

  A) Protostar

  B) Main Sequence Star

  C) Red Giant

  D) White Dwarf

  E) Black Dwarf

  F) Red Super Giant

  G) Supernova

  H) Black Hole

  I) Neutron Star

  
• Stars become unstable due to no more hydrogen nuclei that can fuse together
• The Sun was formed when nebula was pulled together by gravity