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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"
Stars and Dust Across Corona Australis
03/04/2006
Doomed Star Eta Carinae
26/03/2006
When Roses Aren't Red
24/03/2006
Eta and Keyhole in the Carina Nebula
16/03/2006
Messier 101
02/03/2006
The Flaming Star Nebula from CFHT
28/02/2006
Inside the Eagle Nebula
26/02/2006
Wisps Surrounding the Horsehead Nebula
21/02/2006
Dust and Light in the Rosette Nebula
14/02/2006
The N44 Emission Nebula
13/02/2006
M8: The Lagoon Nebula
10/02/2006
The N44 Superbubble
06/02/2006
Thor's Helmet in H-Alpha
02/02/2006
NGC 1999: South of Orion
30/01/2006
The LMC Galaxy in Glowing Gas
23/01/2006
LL Ori and the Orion Nebula
20/01/2006
Orion Nebula: The Hubble View
19/01/2006
Infrared Helix
12/01/2006
The Tadpoles of IC 410
11/01/2006
M45: The Pleiades Star Cluster
09/01/2006
The Tarantula Nebula
06/01/2006
The Iris Nebula from CFHT
29/12/2005
IC 2118: The Witch Head Nebula
27/12/2005
The Mysterious Cone Nebula
25/12/2005
Hydrogen and Dust in the Rosette Nebula
23/12/2005
Andromeda Island Universe
22/12/2005
30 Doradus: The Tarantula Zone
12/12/2005
R136: The Massive Stars of 30 Doradus
11/12/2005
The Veil Nebula Unveiled
06/12/2005
Crab Nebula Mosaic from HST
02/12/2005