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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"
NGC 2359: Thor's Helmet
15/02/2014
IC 1805: Light from the Heart
14/02/2014
Downtown Auriga
13/02/2014
The Heart and Soul Nebulas
11/02/2014
Night Hides the World
07/02/2014
Mars and Orion over Monument Valley
02/02/2014
NGC 6188 and NGC 6164
01/02/2014
Spitzer's Orion
15/01/2014
The Gegenschein Over Chile
14/01/2014
The Seagull Nebula
11/01/2014
NGC 7293: The Helix Nebula
10/01/2014
The Tadpoles of IC 410
09/01/2014
The Horsehead Nebula
31/12/2013
Melotte 15 in the Heart
27/12/2013
Sharpless 308: Star Bubble
24/12/2013
Geminid Meteors over Chile
23/12/2013
The Bubble Nebula
14/12/2013
Alnitak, Alnilam, Mintaka
12/12/2013
Planetary Nebula Abell 7
05/12/2013
The Colorful Clouds of Rho Ophiuchi
03/12/2013
NGC 1999: South of Orion
28/11/2013
From California to the Pleiades
22/11/2013
NGC 7841: The Smoke Nebula in Frustriaus
01/11/2013
A Spectre in the Eastern Veil
30/10/2013
Horsehead and Orion Nebulas
29/10/2013
A Massive Star in NGC 6357
22/10/2013
Three Galaxies and a Comet
20/10/2013
Sh2-155: The Cave Nebula
19/10/2013
The Great Carina Nebula
15/10/2013
M78: Stardust and Starlight
10/10/2013