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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"
NGC 1579: Trifid of the North
25/05/2006
The Gum Nebula
19/05/2006
Shell Game in the LMC
18/05/2006
Comet Meets Ring Nebula: Part II
12/05/2006
Comet Meets Ring Nebula: Part I
11/05/2006
The Large Cloud of Magellan
10/05/2006
NGC 2440: Cocoon of a New White Dwarf
07/05/2006
NGC 7635: Bubble in a Cosmic Sea
28/04/2006
A Dust Cloud in NGC 281
20/04/2006
NGC 246 and the Dying Star
18/04/2006
Barnard's Loop around the Horsehead Nebula
17/04/2006
Molecular Cloud Barnard 68
09/04/2006
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