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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"
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
Trifid Pillars & Jets
28/12/2003
The Pleiades Star Cluster
27/12/2003
Young Star, Dark Cloud
26/12/2003
N159 and the Papillon Nebula
21/12/2003
Inside the Elephant's Trunk
19/12/2003
NGC 604: Giant Stellar Nursery
09/12/2003
NGC 2392 Nebula from Hubble
07/12/2003
Startling Star V838 Mon
05/12/2003
The Turbulent Neighborhood of Eta Carina
26/11/2003
IC 405: The Flaming Star Nebula
24/11/2003
LL Orionis: When Cosmic Winds Collide
15/11/2003
The Lynx Arc
05/11/2003