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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"
The Comet, the Owl, and the Galaxy
21/04/2016
Andromeda on the Rocks
19/04/2016
Orion in Red and Blue
13/04/2016
Close-up of the Bubble Nebula
03/04/2016
NGC 6188 and NGC 6164
30/03/2016
Orion's Belt and Sword over Teide's Peak
28/03/2016
NGC 6357: Cathedral to Massive Stars
27/03/2016
Close Comet and the Milky Way
25/03/2016
The Great Nebula in Carina
23/03/2016
The W in Cassiopeia
18/03/2016
Dark Nebulas across Taurus
14/03/2016
IC 1848: The Soul Nebula
28/02/2016
The Tarantula Nebula
26/02/2016
Milky Way over the Pinnacles in Australia
17/02/2016
Star Forming Region S106
16/02/2016
Massive Stars in NGC 6357
05/02/2016
Galaxy Wars: M81 versus M82
03/02/2016
MWC 922: The Red Square Nebula
31/01/2016
Star Cluster R136 Bursts Out
24/01/2016
Big Dipper, Deep Sky
23/01/2016
21st Century M101
22/01/2016
Stars and Globules in the Running Chicken Nebula
20/01/2016
Infrared Portrait of the Large Magellanic Cloud
14/01/2016
Reflections on the 1970s
13/01/2016
The California Nebula
12/01/2016
The Lagoon Nebula in Hydrogen, Sulfur, and Oxygen
05/01/2016
The Fox Fur Nebula
30/12/2015
Dust of the Orion Nebula
29/12/2015
Doomed Star Eta Carinae
27/12/2015
The Horsehead Nebula
16/12/2015