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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"
M1: The Crab Nebula from Hubble
25/10/2009
NGC 7331 and Beyond
24/10/2009
The Star Pillars of Sharpless 171
18/10/2009
Bright Nebulae of M33
17/10/2009
Pleiades and Stardust
14/10/2009
The Lagoon Nebula from GigaGalaxy Zoom
06/10/2009
Comet and Orion
02/10/2009
Carina Pillar and Jets
01/10/2009
Orion in Gas, Dust, and Stars
29/09/2009
Gigagalaxy Zoom: Galactic Center
25/09/2009
The Tarantula Zone
16/09/2009
NGC 6888: The Crescent Nebula
15/09/2009
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