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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"
X-rays and the Eagle Nebula
24/02/2007
Dust and the Helix Nebula
23/02/2007
Mystery Over Australia
22/02/2007
M16: Pillars of Creation
18/02/2007
Planetary Nebula NGC 2440
15/02/2007
The Rosette Nebula
14/02/2007
Flame Nebula Close-Up
02/02/2007
Thor's Helmet from CFHT
30/01/2007
Orion's Cradle
25/01/2007
Kepler's Supernova Remnant in X-Rays
16/01/2007
The Eagle Nebula in Infrared
11/01/2007
The Orion Deep Field
06/01/2007
Central Cygnus
04/01/2007
NGC 6960: The Witch's Broom Nebula
01/01/2007
Alnitak, Alnilam, Mintaka
29/12/2006
IC 5067: Emission Nebula Close-up
27/12/2006
Star Forming Region NGC 6357
20/12/2006
Massive Stars in Open Cluster Pismis 24
19/12/2006
A Path To Orion
16/12/2006
IC 2118: The Witch Head Nebula
11/12/2006
NGC 2174: Emission Nebula in Orion
08/12/2006
A Pelican in the Swan
30/11/2006
M42: Wisps of the Orion Nebula
20/11/2006
The Cat's Eye Nebula
12/11/2006
M51: Cosmic Whirlpool
11/11/2006
Messier 76
02/11/2006
SH2 136: A Spooky Nebula
31/10/2006
The Spider and The Fly
27/10/2006
Composite Crab
26/10/2006
Star EGGs in the Eagle Nebula
22/10/2006