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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"
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
The Bubble and M52
08/10/2013
The Fairy of Eagle Nebula
29/09/2013
Andromeda on the Rocks
27/09/2013
M81 versus M82
25/09/2013
IC 4628: The Prawn Nebula
23/09/2013
M2-9: Wings of a Butterfly Nebula
15/09/2013
Stars and Dust Across Corona Australis
12/09/2013
Nearby Cepheid Variable RS Pup
09/09/2013
M1: The Incredible Expanding Crab
05/09/2013
IRAS 20324: Evaporating Protostar
04/09/2013
North America and the Pelican
03/09/2013
NGC 5195: The Dot Under the Question Mark
31/08/2013
A Sagittarius Triplet
30/08/2013
Bright Planetary Nebula NGC 7027 from Hubble
26/08/2013
A Spectrum of Nova Delphini
23/08/2013
IC 5067 in the Pelican Nebula
22/08/2013
M8: The Lagoon Nebula
17/08/2013
In the Vicinity of the Cone Nebula
06/08/2013