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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"
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
Cygnus: Bubble and Crescent
04/12/2015
Nebulae in Auriga
01/12/2015
A 212-Hour Exposure of Orion
23/11/2015
Leonids and Friends
20/11/2015
The Pelican Nebula in Gas, Dust, and Stars
17/11/2015
A Blazing Fireball between the Orion Nebula and Rigel
16/11/2015
The Tadpoles of IC 410
13/11/2015
AE Aurigae and the Flaming Star Nebula
10/11/2015
NGC 1333: Stellar Nursery in Perseus
05/11/2015
The Great Orion Nebula M42
04/11/2015
Seeking Venus under the Spitzkoppe Arch
03/11/2015
The Witch Head Nebula
30/10/2015
IC 1871: Inside the Soul Nebula
29/10/2015
Bright from the Heart Nebula
27/10/2015
Star Factory Messier 17
22/10/2015
The Southern Cross in a Southern Sky
19/10/2015
Night Hides the World
16/10/2015