| A | B |
|---|
| Nebula | a stellar nursery of dust and gas |
| Protostar | a newborn star |
| Main-Sequence Star | has a temperature hot enough for nuclear fusion to begin and is now an official star |
| Giant Star | when a star enlarges when they run out of Hydrogen and has a mass the size of the sun or lower |
| White Dwarf | when a star runs out of Helium and shrinks to size of earth and increases in temperature |
| Black Dwarf | when a star comletely runs out of fuel and dies (burns out) no longer emitting light |
| Supergiant Star | when a star with higher mass than the sun runs out of Hydrogen and starts fusing Helium then becomes supersized |
| Supernova | when a star of higher mass than the sun tries to fuse Iron and can't, then it explodes |
| Neutron Star | left after a star explodes and is very dense (teaspoon a billion tons) with pulsing EMR |
| Black Hole | left after the explosion of the most massive stars and leaves a singular point so high in gravity that even light cannot escape |
