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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"
Star Factory Messier 17
30/06/2011
Stardust and Betelgeuse
28/06/2011
Stars and Dust Across Corona Australis
27/06/2011
NGC 3132: The Eight Burst Nebula
26/06/2011
Eclipsed Moon in the Milky Way
17/06/2011
M64: The Sleeping Beauty Galaxy
12/06/2011
Supernovae in the Whirlpool
11/06/2011
The Great Carina Nebula
09/06/2011
An Unexpected Flare from the Crab Nebula
23/05/2011
A Journey Through the Night Sky
20/05/2011
A Beautiful Trifid
13/05/2011
The Southern Cliff in the Lagoon
11/05/2011
Molecular Cloud Barnard 163
01/05/2011
The Dark Tower in Scorpius
27/04/2011
Hydrogen in the LMC
26/04/2011
Monsters of IC 1396
25/04/2011
The Cat's Eye Nebula from Hubble
24/04/2011
Visual Effects: Wonders of the Universe
18/04/2011
The Tadpoles of IC 410
16/04/2011
Messier 101
15/04/2011
Young Stars in the Rho Ophiuchi Cloud
14/04/2011
Planetary Nebula NGC 2438
07/04/2011
T Tauri and Hind's Variable Nebula
26/03/2011
MWC 922: The Red Square Nebula
23/03/2011
AE Aurigae and the Flaming Star Nebula
11/03/2011
NGC 6914 Nebulae
04/03/2011
NGC 1499: The California Nebula
02/03/2011
NGC 1999: South of Orion
24/02/2011
Milky Way Over Switzerland
21/02/2011
Planetary Nebula Project
18/02/2011