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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"
M51 Hubble Remix
14/06/2008
The Dark River to Antares
03/06/2008
Dark Clouds of the Carina Nebula
28/05/2008
Windblown NGC 3199
22/05/2008
The M81 Galaxy Group Through the Integrated Flux Nebula
12/05/2008
The Dark Tower in Scorpius
08/05/2008
Alborz Mountain Milky Way
03/05/2008
Shaping NGC 6188
02/05/2008
Star Forming Region NGC 3582
28/04/2008
The Tarantula Zone
26/04/2008
Cygnus Without Stars
24/04/2008
The Fox Fur Nebula from CFHT
22/04/2008
IC 2948: The Running Chicken Nebula
18/04/2008
A Protected Night Sky Over Flagstaff
16/04/2008
Sky Delights Over Sweden
15/04/2008
Curious Cometary Knots in the Helix Nebula
13/04/2008
Southern Orion: From Belt to Witch
08/04/2008
Wisps Surrounding the Horsehead Nebula
06/04/2008
South of Orion
03/04/2008
The N44 Complex
27/03/2008
The NGC 3576 Nebula
26/03/2008
Molecular Cloud Barnard 68
23/03/2008
Cat's Eye Hubble Remix
22/03/2008
Where is HD 189733?
21/03/2008
M78 and Reflecting Dust Clouds in Orion
18/03/2008
Sculpting the South Pillar
13/03/2008
Comet over California
07/03/2008
Vela Supernova Remnant
06/03/2008
NGC 6334: The Cat's Paw Nebula
04/03/2008
The Eagle Nebula in Hydrogen, Oxygen, and Sulfur
27/02/2008