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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"
Cepheus: Trunk to Bubble
09/09/2010
Space Shuttle Tribute Poster: Endeavour
07/09/2010
The Bubble Nebula
02/09/2010
The Annotated Galactic Center
31/08/2010
M27: Not a Comet
26/08/2010
Pelican Nebula Close-up
19/08/2010
IRAS 05437+2502: An Enigmatic Star Cloud from Hubble
09/08/2010
M8: The Lagoon Nebula
05/08/2010
The Trifid Nebula is Stars and Dust
28/07/2010
Messier 76
23/07/2010
Dark River, Wide Field
19/07/2010
Shaping NGC 6188
16/07/2010
Dim World, Dark Nebula
08/07/2010
The Starry Night of Alamut
25/06/2010
The Dark Tower in Scorpius
24/06/2010
Starry Night Scavenger Hunt
15/06/2010
The Red Rectangle Nebula from Hubble
14/06/2010
The Medusa Nebula
12/06/2010
Hydrogen in M51
11/06/2010
Thor's Helmet
05/06/2010
WISE: Heart and Soul Nebulas in Infrared
01/06/2010
Rho Ophiuchi Wide Field
24/05/2010
Tentacles of the Tarantula Nebula
18/05/2010
The Elusive Jellyfish Nebula
15/05/2010
Iguaçu Starry Night
14/05/2010
The Magnificent Horsehead Nebula
13/05/2010
Halo of the Cat's Eye
09/05/2010
Northern and Southern Owls
06/05/2010
A Pulsar's Hand
01/05/2010
Dust Pillar of the Carina Nebula
26/04/2010