The birth of a star begins when molecular clouds are pulled together by gravity. These stars are formed in Planetary Nebulae
When the star reaches a certain temperature, nuclear fusion starts. This star is in it's main sequence stage. The energy that this nuclear fusion creates is released in the form of radiation
When the star uses all of its resources, it becomes a red giant
When the star uses the last of its resources the star gets smaller and smaller. It is no longer a red giant, but a red dwarf
As time goes on, the star densifies, causing it to heat up and change color. All the outlet layers of the star have drifted off into space leaving the white dwarf stripped to its core
The last cycle in a star's life is the supernova. The gravity within the star becomes too strong for it to hold that creates an explosion that is super powerful. It has the potential to create a black hole!