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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 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
A Wide Field Image of the Galactic Center
06/01/2012
The Diner at the Center of the Galaxy
30/12/2011
Comet Lovejoy over Paranal
28/12/2011
M27: The Dumbbell Nebula
27/12/2011
M1: The Crab Nebula from Hubble
25/12/2011
In the Vicinity of the Cone Nebula
13/12/2011
Sh2-239: Celestial Impasto
08/12/2011
Pelican Nebula Close-up
26/11/2011
W5: Pillars of Star Formation
20/11/2011
In Wolf's Cave
19/11/2011
Pleiades to Hyades
17/11/2011
NGC 7822 in Cepheus
16/11/2011