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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"
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
A Starry Night in Brazil
09/05/2009
A Halo for NGC 6164
07/05/2009
NGC 2392 Nebula from Hubble
03/05/2009
Dark Markings of the Sky
25/04/2009
Sharpless 308
23/04/2009
NGC 1333 Stardust
18/04/2009
The Big Picture
11/04/2009
In the Heart of the Tarantula Nebula
31/03/2009
The Seagull Nebula
27/03/2009
Stars Young and Old
26/03/2009
The Seahorse of the Large Magellanic Cloud
23/03/2009
Thor's Helmet (NGC 2359) and Planetary Nebula
12/03/2009
Horsehead and Orion Nebulae
10/03/2009
IC 5146: The Cocoon Nebula
05/03/2009
The Helix Nebula from La Silla Observatory
03/03/2009
Barnard's Loop around the Horsehead Nebula
24/02/2009
Orion Nebula: The Hubble View
22/02/2009
Snake in the Dark
20/02/2009