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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"
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
The North America and Pelican Nebulas
16/08/2006
IC 410 and NGC 1893
15/08/2006
Horse Head Shaped Reflection Nebula IC 4592
08/08/2006
Still Life with NGC 2170
05/08/2006
M27: Not A Comet
03/08/2006
NGC 7331 and Beyond
27/07/2006
Reflecting Merope
15/07/2006
The Colorful Clouds of Rho Ophiuchi
14/07/2006
NGC 2392 Nebula from Hubble
09/07/2006
NGC 6888: A Tricolor Starfield
06/07/2006
Spiral Galaxy NGC 2403 from Subaru
05/07/2006
Old Moon and Sister Stars
29/06/2006
The Cat's Paw Nebula
28/06/2006
M57: The Ring Nebula
25/06/2006
East of Antares
23/06/2006
Sagittarius Triplet
14/06/2006
NGC 6164: A Bipolar Emission Nebula
06/06/2006
IC 443: Supernova Remnant and Neutron Star
02/06/2006