1	Star Life Cycle A review of the beginning & end of stars
2	Star Basics All stars begin as clouds of dust & gas called NEBULA What a star becomes depends on how much mass it has when it starts Gravity is the force that begins fusion in stars New stars are called protostars
3	Medium Mass Stars An average mass star (like the Sun) has an average life span of 10 billion years They convert hydrogen to helium mostly They usually can’t fuse any element larger than carbon
4	Medium Mass Stars When a medium mass star runs out of fuel it increases its size to try to cool off & prolong its “life” it becomes a RED GIANT
5	Medium Mass Stars Over time a red giant star will be compressed by gravity It will try to restart its fusion by heating up It will become WHITE DWARF & finally a Black Dwarf (dead star)
6	Massive Stars Stars up to 100 times the mass of the Sun Massive stars follow the same life cycle as medium mass stars until after Red Giant Massive stars contain so much energy they create a tremendous explosion The explosion is called a SUPERNOVA
7	Massive Stars A massive star core can usually fuse elements up to iron After a supernova only the very massive core of the star is left This core is called a NEUTRON STAR A teaspoon of neutron star material is so dense it would have a mass of 100 million tons
8	Supermassive Stars A Supermassive star (over 100 times the sun’s mass) has the same “life cycle” as a massive star The difference is that a Supermassive star becomes a BLACK HOLE Scientists believe that there is a black hole at the center of every spiral & elliptical galaxy
9	Supermassive Stars A black hole is where the core is so massive after the supernova that it collapses in upon itself It becomes a “cosmic vacuum cleaner” sucking even light into it The only way we detect black holes is by x-rays or light given off by something being sucked into it.
10	Medium Star Movie
11	Massive Star Movie
12	Supermassive Star Movie