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Nebula
A nebula is a giant cloud of gas (mostly hydrogen and helium) and cosmic dust situated between stars in the interstellar medium. Nebulae serve as sites of stellar birth and death—including emission nebulae that glow from ionized gas, reflection nebulae that scatter starlight, and dark nebulae that obscure background stars.
Source: science.nasa.gov
APODs including "Nebula"
The Large Magellanic Cloud in Ultraviolet
10/06/2013
Messier Craters in Stereo
08/06/2013
NGC 6302: The Butterfly Nebula
07/06/2013
M57: The Ring Nebula
05/06/2013
Orion Nebula in Oxygen, Hydrogen, and Sulfur
04/06/2013
The Eagle and The Swan
31/05/2013
NGC 6960: The Witch's Broom Nebula
29/05/2013
The Large Cloud of Magellan
28/05/2013
Messier 109
23/05/2013
The Red Rectangle Nebula from Hubble
21/05/2013
Kepler's Supernova Remnant in X-Rays
15/05/2013
Galaxy Cove Vista
07/05/2013
Horsehead: A Wider View
03/05/2013
The Horsehead Nebula in Infrared from Hubble
22/04/2013
NGC 1788 and the Witch's Whiskers
19/04/2013
Star Factory Messier 17
18/04/2013
IC 1848: The Soul Nebula
15/04/2013
NGC 3132: The Southern Ring Nebula
09/04/2013
IC 4592: The Blue Horsehead Reflection Nebula
02/04/2013
Dust Pillar of the Carina Nebula
24/03/2013
Infrared Portrait of the Large Magellanic Cloud
23/03/2013
NGC 2736: The Pencil Nebula
21/03/2013
M42: Inside the Orion Nebula
20/03/2013
NGC 6751: The Glowing Eye Nebula
13/03/2013
Milky Way Panorama from Mauna Kea
10/03/2013
Thor's Helmet
07/03/2013
IC 1805: The Heart Nebula
04/03/2013
Infrared Orion from WISE
13/02/2013
N11: Star Clouds of the LMC
11/02/2013
LL Ori and the Orion Nebula
03/02/2013