This storyboard explains the life cycle of a star. Oddly enough.
Nebula that is full of hydrogen gasses compresses very slowly, until it becomes so compressed to the point where it fuses, producing new elements like helium, along with a bunch of energy
With so many atoms fusing, it caused a huge amount of energy to release, thus creating a star. this star fuses atoms lighter than iron in the core, which is then carried out into the other layers, eventually being released into outer space. this will eventually become a red giant as it gets older, which is just a bigger (and red) star that now fuses iron and everything lighter than iron.
Finally, the star will lose all the hydrogen that it used for fuel to the point where it eventually dies, however, these stars do leave something behind, either being a planetary nebula, which is just a bigger stellar nebula, or not die all together and instead become a white dwarf, which is a tiny but bright star.