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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"
Molecular Cloud Barnard 68
29/01/2012
The Hunter's Stars
19/01/2012
IC 2118: The Witch Head Nebula
17/01/2012
Infrared Portrait of the Large Magellanic Cloud
15/01/2012
NGC 6369: The Little Ghost Nebula
14/01/2012
A Wide Field Image of the Galactic Center
06/01/2012
The Diner at the Center of the Galaxy
30/12/2011
Comet Lovejoy over Paranal
28/12/2011
M27: The Dumbbell Nebula
27/12/2011
M1: The Crab Nebula from Hubble
25/12/2011
In the Vicinity of the Cone Nebula
13/12/2011
Sh2-239: Celestial Impasto
08/12/2011
Pelican Nebula Close-up
26/11/2011
W5: Pillars of Star Formation
20/11/2011
In Wolf's Cave
19/11/2011
Pleiades to Hyades
17/11/2011
NGC 7822 in Cepheus
16/11/2011
The Butterfly Nebula from Hubble
13/11/2011
Star Forming Region S106
07/11/2011
GK Per: Nova of 1901
05/11/2011
IC 59 and IC 63 in Cassiopeia
03/11/2011
NGC 7380: The Wizard Nebula
02/11/2011
Ghost of the Cepheus Flare
31/10/2011
IC 1805: The Heart Nebula in HDR
25/10/2011
HH-222: The Waterfall Nebula
24/10/2011
Clouds of Perseus
21/10/2011
The Color of IC 1795
13/10/2011
NGC 7635: The Bubble Nebula
11/10/2011
Cocoon Nebula Wide Field
29/09/2011
Spitzer's Orion
17/09/2011