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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"
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
M16 and the Eagle Nebula
15/10/2015
A Gegenschein Lunar Eclipse
14/10/2015
The Elephant's Trunk in IC 1396
13/10/2015
Galaxy, Stars, and Dust
12/10/2015
In the Center of the Trifid Nebula
11/10/2015
Stardust in Perseus
10/10/2015
Orion Over and Under Tibet
05/10/2015
LDN 988 and Friends
24/09/2015
Pickering's Triangle in the Veil
17/09/2015
A Giant Squid in the Flying Bat
11/09/2015
NGC 4372 and the Dark Doodad
10/09/2015
The Shark Nebula
07/09/2015
The Seagull Nebula
29/08/2015