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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"
Scorpius in Red and Blue
25/05/2012
Star Formation in the Tarantula Nebula
16/05/2012
Spiral Galaxy NGC 1672 from Hubble
13/05/2012
In the Center of the Omega Nebula
06/05/2012
Evaporating Blobs of the Carina Nebula
23/04/2012
M57: The Ring Nebula
20/04/2012
Antares and Clouds
17/04/2012
The Eagle Nebula from Kitt Peak
16/04/2012
A Fox Fur, a Unicorn, and a Christmas Tree
10/04/2012
Zodiacal Light Panorama
05/04/2012
M46 & M47: Star Clusters Young and Old
03/04/2012
Messier 9 Close-up
23/03/2012
The M81 Galaxy Group Through the Integrated Flux Nebula
13/03/2012
NGC 1579: Trifid of the North
09/03/2012
The Seagull Nebula
08/03/2012
NGC 2170: Celestial Still Life
06/03/2012
Aurigae Nebulae
24/02/2012
Barred Spiral Galaxy NGC 1073
20/02/2012
On the Road to Carina
18/02/2012
Merope's Reflection Nebula
15/02/2012
The Rosette Nebula
14/02/2012
Orion in Gas, Dust, and Stars
12/02/2012
Dust of the Orion Nebula
06/02/2012
Inside the Eagle Nebula
03/02/2012
The Helix Nebula from the VISTA Telescope
31/01/2012
Molecular Cloud Barnard 68
29/01/2012
The Hunter's Stars
19/01/2012
IC 2118: The Witch Head Nebula
17/01/2012
Infrared Portrait of the Large Magellanic Cloud
15/01/2012
NGC 6369: The Little Ghost Nebula
14/01/2012