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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"
The Fairy of Eagle Nebula
21/08/2011
Herschel's Cocoon
19/08/2011
Shapley 1: An Annular Planetary Nebula
16/08/2011
NGC 7331 and Beyond
12/08/2011
MyCn18: An Hourglass Planetary Nebula
07/08/2011
A Dusty Iris Nebula
04/08/2011
NGC 6188 and NGC 6164
28/07/2011
Milky Way Over Abandoned Kilns
25/07/2011
A Total Lunar Eclipse Over Tajikistan
Video preview available on open
Video
11/07/2011
A Milky Way Band
10/07/2011
Arp 78: Peculiar Galaxy in Aries
07/07/2011
Southern Ocean Sky
Video preview available on open
Video
04/07/2011
VAR!
01/07/2011
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