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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"
Planetary Nebula Mz3: The Ant Nebula
25/04/2010
Wide Angle: The Cat's Paw Nebula
21/04/2010
Unusual Spiral Galaxy M66 from Hubble
13/04/2010
IC 418: The Spirograph Nebula
11/04/2010
Spitzer's Orion
10/04/2010
A Fox Fur, a Unicorn, and a Christmas Tree
06/04/2010
M16: Pillars of Creation
28/03/2010
Young Moon and Sister Stars
26/03/2010
NGC 2442: Galaxy in Volans
25/03/2010
Zodiacal Light Vs. Milky Way
20/03/2010
The Seagull and the Duck
19/03/2010
Fermi Catalogs the Gamma-ray Sky
18/03/2010
Galaxies Beyond the Heart: Maffei 1 and 2
09/03/2010
Deep Auriga
05/03/2010
M78 and Reflecting Dust Clouds in Orion
02/03/2010
Chasing Carina
26/02/2010
Galaxy Group Hickson 31
22/02/2010
NGC 2440: Cocoon of a New White Dwarf
21/02/2010
Geostationary Highway
20/02/2010
Field of Rosette
14/02/2010
Stardust in Perseus
04/02/2010
Messier 88
30/01/2010
Dust and the NGC 7771 Group
21/01/2010
The Spider and The Fly
13/01/2010
The Flame Nebula in Infrared
12/01/2010
Andromeda Island Universe
09/01/2010
Dust and the Helix Nebula
31/12/2009
Spitzer's M101
30/12/2009
Rigel and the Witch Head Nebula
29/12/2009
Barred Spiral Galaxy NGC 6217
28/12/2009