150 Notable Nebulae
An A-to-Z list of 150 notable nebulae of the night sky. Nebulae are interstellar gas and dust clouds that emit (emission nebulae), reflect (reflection nebulae), or absorb (dark nebulae) light of different wavelengths. Many large nebulae can have emission, reflection, and dark components, such as the large Orion nebula. Supernova remnants (SNR) are a type of emission nebula. See sidebar for more information.
Dim, diffuse objects like nebulae require lots of telescope aperture and are ideal for viewing with a dobsonian telescope.