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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"
Shell Game in NGC 300
22/08/2002
Spiral Galaxy NGC 300
21/08/2002
Giant Emission Nebula NGC 3603 in Infrared
14/08/2002
Gomez's Hamburger: A Proto-Planetary Nebula
07/08/2002
Henize 3-401: An Elongated Planetary Nebula
31/07/2002
Open Cluster NGC 6520 from CFHT
22/07/2002
The Crab Nebula from VLT
14/07/2002
M51: Cosmic Whirlpool
10/07/2002
Weighing Empty Space
08/07/2002
The Fox Fur Nebula
01/07/2002
In the Center of the Trifid Nebula
26/06/2002
IC 4406: A Seemingly Square Nebula
18/06/2002
MyCn18: An Hourglass Nebula
15/06/2002
The Tarantula Zone
13/06/2002
Inside the Eagle Nebula
11/06/2002
A Chamaeleon Sky
09/06/2002
Portrait of an Infant Solar System
07/06/2002
Cone Nebula Infrared Close-Up
06/06/2002
NGC 2266: Old Cluster in the New General Catalog
01/06/2002
The Pipe Dark Nebula
26/05/2002
East of the Lagoon Nebula
20/05/2002
Andromeda Island Universe
18/05/2002
N44C: A Nebular Mystery
14/05/2002
At the Edge of the Helix Nebula
12/05/2002
Cone Nebula Close-Up
03/05/2002
In the Center of the Omega Nebula
01/05/2002
Doomed Star Eta Carinae
28/04/2002
The Trifid Nebula from AAO
24/04/2002
Orion Nebula: The 2MASS View
20/04/2002
The Snake Nebula from CFHT
09/04/2002