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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"
Central Cygnus
04/01/2007
NGC 6960: The Witch's Broom Nebula
01/01/2007
Alnitak, Alnilam, Mintaka
29/12/2006
IC 5067: Emission Nebula Close-up
27/12/2006
Star Forming Region NGC 6357
20/12/2006
Massive Stars in Open Cluster Pismis 24
19/12/2006
A Path To Orion
16/12/2006
IC 2118: The Witch Head Nebula
11/12/2006
NGC 2174: Emission Nebula in Orion
08/12/2006
A Pelican in the Swan
30/11/2006
M42: Wisps of the Orion Nebula
20/11/2006
The Cat's Eye Nebula
12/11/2006
M51: Cosmic Whirlpool
11/11/2006
Messier 76
02/11/2006
SH2 136: A Spooky Nebula
31/10/2006
The Spider and The Fly
27/10/2006
Composite Crab
26/10/2006
Star EGGs in the Eagle Nebula
22/10/2006
IC 4628: The Prawn Nebula
20/10/2006
NGC 7635: The Bubble
18/10/2006
An Orion Deep Field
15/10/2006
Reflection Nebulas in Orion
10/10/2006
Dusty NGC 1333
06/10/2006
Light from the Heart Nebula
03/10/2006
NGC 1499: The California Nebula
24/09/2006
Central IC 1805
22/09/2006
Star Clusters Young and Old
10/09/2006
Messier 110
08/09/2006
Blue Lagoon
25/08/2006
Spitzer's Orion
18/08/2006