| A | B |
|---|
| gravity pulls the gas and dust into a ball | protostar |
| hydrogen all used up so helium is used for fusion instead...this makes the star get really big | red giant or supergiant |
| first stage when there is only a cloud of gas and dust | nebula |
| the very hot and dense core that is left over after a planetary nebula or supernoa | dwarf or neutron star |
| helium runs out, so fusion stops; this causes the outer layer to come off and form a cloud | planetary nebula |
| extremely large star collapses on itself and it sucks in everything, including light | black hole |
| extremely large star used up all its fuel which causes a gigantic explosion | supernova |
| longest stage when fusion is turning hydrogen into helium | main sequence |
