These nebulae are frequently illuminated by ultraviolet light which is emitted from the newborn stars. One example of a stellar nursery is the Eagle nebula pictured above. As the giant star explodes, the core of the star is exposed.
Planetary nebulae have nothing to do with planets.
The reddish light is produced when electrons and protons combine, forming hydrogen atoms. The free electrons combine with protons, forming hydrogen and red light. A reflection nebula is a nebula that glows as the dust in it reflects the light of nearby stars. These nebulae are frequently bluish in color because blue light is more efficiently reflected than red light. A reflection nebula surrounds the Pleiades Cluster .