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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 4406: A Seemingly Square Nebula
27/07/2008
Central IC 1805
26/07/2008
Spitzer's M101
25/07/2008
M16 and the Eagle Nebula
19/07/2008
Gas and Dust of the Lagoon Nebula
15/07/2008
NGC 7331 and Beyond
12/07/2008
The Southern Cross in a Southern Sky
07/07/2008
Pickering's Triangle from Kitt Peak
01/07/2008
In the Center of the Trifid Nebula
30/06/2008
M27: Not A Comet
26/06/2008
What is Hanny's Voorwerp?
25/06/2008
Eta Carinae and the Homunculus Nebula
17/06/2008
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