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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"
In the Center of NGC 6559
29/06/2004
The Trifid Nebula from Hubble
18/06/2004
Cosmic Construction Zone RCW 49
03/06/2004
The Colorful Clouds of Rho Ophiuchi
02/06/2004
Cone Nebula Close-Up
29/05/2004
Sharpless 140
20/05/2004
NGC 3372: The Great Nebula in Carina
17/05/2004
Rungs of the Red Rectangle
13/05/2004
Antares and Rho Ophiuchi
09/05/2004
NGC 6302: Big, Bright, Bug Nebula
05/05/2004
Titan's X-Ray
29/04/2004
M27: Not A Comet
24/04/2004
Nebulas Surrounding Wolf-Rayet Binary BAT99-49
21/04/2004
Venus and the Pleiades
15/04/2004
Elusive Jellyfish Nebula
08/04/2004
Unusual Spiral Galaxy M66
07/04/2004
Stars and the Bubble Nebula
28/03/2004
An Orion of a Different Color
25/03/2004
The Orion Nebula from CFHT
15/03/2004
Henize 206: Cosmic Generations
11/03/2004
NGC 6960: The Witch's Broom Nebula
02/03/2004
McNeil's Nebula
19/02/2004
M64: The Sleeping Beauty Galaxy
11/02/2004
In the Center of the Omega Nebula
08/02/2004
NGC 6369: The Little Ghost Nebula
07/02/2004
The Tarantula Nebula from Spitzer
02/02/2004
M2-9: Wings of a Butterfly Nebula
01/02/2004
The Crab Nebula from CFHT
28/01/2004
An Orion Deep Field
15/01/2004
NGC 2440: Cocoon of a New White Dwarf
11/01/2004