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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"
Great Orion Nebulae
23/10/2008
A Dark Pulsar in CTA 1
21/10/2008
In the Center of the Lagoon Nebula
19/10/2008
Sharpless 171
18/10/2008
Camera Orion
15/10/2008
Irregular Galaxy NGC 55
10/10/2008
Massive Stars in NGC 6357
09/10/2008
Dust Mountains in the Carina Nebula
07/10/2008
Exploring the Ring
18/09/2008
W5: Pillars of Star Creation
16/09/2008
The Heart and Soul Nebulas
14/09/2008
Spokes in the Helix Nebula
04/09/2008
Generations of Stars in W5
29/08/2008
IC 5146: The Cocoon Nebula
27/08/2008
NGC 7008: The Fetus Nebula
25/08/2008
NGC 6960: The Witch's Broom Nebula
19/08/2008
NGC 6888: The Crescent Nebula
13/08/2008
X-Rays from the Cat's Eye Nebula
04/08/2008
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