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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 604: Giant Stellar Nursery
02/11/2002
Leonids Over Uluru
30/10/2002
IC 5146: The Cocoon Nebula
14/10/2002
Dusty Environs of Eta Carinae
10/10/2002
The Lagoon Nebula in Three Colors
06/10/2002
V838 Mon: Mystery Star
03/10/2002
Star Clouds Toward the Southern Crown
02/10/2002
The Crab Nebula Pulsar Shrugs
20/09/2002
A Sagittarius Starscape
18/09/2002
Halo of the Cat's Eye
04/09/2002
The Pelican in the Swan
29/08/2002
Nebula Nova Cygni Turns On
25/08/2002
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