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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 4592: The Blue Horsehead Reflection Nebula
02/04/2013
Dust Pillar of the Carina Nebula
24/03/2013
Infrared Portrait of the Large Magellanic Cloud
23/03/2013
NGC 2736: The Pencil Nebula
21/03/2013
M42: Inside the Orion Nebula
20/03/2013
NGC 6751: The Glowing Eye Nebula
13/03/2013
Milky Way Panorama from Mauna Kea
10/03/2013
Thor's Helmet
07/03/2013
IC 1805: The Heart Nebula
04/03/2013
Infrared Orion from WISE
13/02/2013
N11: Star Clouds of the LMC
11/02/2013
LL Ori and the Orion Nebula
03/02/2013
NGC 4372 and the Dark Doodad
31/01/2013
In the Center of the Trifid Nebula
28/01/2013
ISS and the Summer Milky Way
24/01/2013
The Cygnus Wall of Star Formation
22/01/2013
Barnard Stares at NGC 2170
19/01/2013
NGC 2170: Celestial Still Life
14/01/2013
The Orion Bullets
10/01/2013
The Elusive Jellyfish Nebula
09/01/2013
AE Aurigae and the Flaming Star Nebula
07/01/2013
The Dark Tower in Scorpius
06/01/2013
Doomed Star Eta Carinae
30/12/2012
NGC 6188 and NGC 6164
28/12/2012
NGC 5189: An Unusually Complex Planetary Nebula
19/12/2012
MWC 922: The Red Square Nebula
16/12/2012
NGC 604: Giant Stellar Nursery
11/12/2012
Clouds in Cygnus
30/11/2012
Wisps of the Veil Nebula
26/11/2012
The Pipe Nebula
23/11/2012