“We have H II regions, pronounced H 2, these are mostly Hydrogen based and are active star making regions.

Emission Nebulae, are made of ionized gasses and usually have a Star nearby, many of them appear red.

Dark Nebulae, which are clouds of dust so dense that they hide the light behind them.

Reflection Nebula which reflects the light of stars around them instead of creating their own.

Planetary, which have nothing to do with planets actually and are shells of gas that are emitted when stars die.

And finally,

Supernova remnants, which are created when a star dies in a massive explosion known as a supernova.”