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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 Butterfly Nebula from Upgraded Hubble
10/09/2009
Supernova Remnant E0102-72
05/09/2009
NGC 7822 in Cepheus
28/08/2009
Classic Orion Nebulae
26/08/2009
The Gum Nebula
22/08/2009
IC 1396 and Surrounding Starfield
19/08/2009
Irregular Galaxy NGC 55
12/08/2009
T Tauri: A Star is Formed
03/08/2009
Stars, Dust and Nebula in NGC 6559
02/08/2009
The Milky Way Over Devils Tower
29/07/2009
The Lagoon Nebula in Gas, Dust, and Stars
22/07/2009
The Horsehead Nebula
21/07/2009
The Chameleon's Dark Nebulae
15/07/2009
The Pillars of Eagle Castle
10/07/2009
Fermi's Gamma-ray Pulsars
09/07/2009
The Dark River to Antares
08/07/2009
The Trifid Nebula in Stars and Dust
07/07/2009
The North America and Pelican Nebulae
30/06/2009
Molecular Cloud Barnard 68
23/06/2009
Streaming Dark Nebulas near B44
15/06/2009
A Dusty Iris Nebula
10/06/2009
Stars and Dust Across Corona Australis
05/06/2009
A Beautiful Trifid
30/05/2009
Whirlpool Galaxy Deep Field
26/05/2009
Carina Nebula Panorama from Hubble
24/05/2009
East of Antares
22/05/2009
IC 4592: A Blue Horsehead
21/05/2009
Sagittarius and the Central Milky Way
19/05/2009
M97: The Owl Nebula
15/05/2009
Elusive Jellyfish Nebula
14/05/2009