Two well know nebulae are the Crab and Horsehead nebulae.
emission nebulae and reflection nebulae.
Andromeda, Milky Way These are galaxies ^ Orion Nebula Eagle Nebula
See related link
hydrogen and helium
Two well know nebulae are the Crab and Horsehead nebulae.
emission nebulae and reflection nebulae.
emission nebulae and reflection nebulae.
emission nebulae and reflection nebulae.
Andromeda, Milky Way These are galaxies ^ Orion Nebula Eagle Nebula
See related link
Ionized hydrogen and helium are the most abundant chemical elements in nebulae.
hydrogen and helium
There are two meteor showers: The Geminids on December 13-14 and the Epsilon Geminids on October 18 - 29. There are two planetary nebulae: The Eskimo and Medusa nebulae. There is an open cluster M35 (NGC 2168).
In astronomy, diffuse nebulae is the general term for illuminated nebulae. The three types of diffuse nebulae are reflection nebulae, emission nebulae and supernova remnants. They are diffuse as opposed to the non-diffuse dark nebulae, i.e. the particles have spread out.
Eagle Nebula Orion Nebula
Planetary nebulae (the cat's eye nebula) Emission nebulae (the orion nebula) Dark nebulae (the horsehead nebula) Supernova remnant nebulae (the crab)