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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"
Two Million Stars on the Move
Video
17/04/2017
Dark Nebula LDN 1622 and Barnard's Loop
06/04/2017
Young Stars and Dusty Nebulae in Taurus
30/03/2017
Nebula with Laser Beams
29/03/2017
The Comet, the Owl, and the Galaxy
24/03/2017
SH2-155: The Cave Nebula
23/03/2017
Central Cygnus Skyscape
22/03/2017
Fast Stars and Rogue Planets in the Orion Nebula
21/03/2017
The Cone Nebula from Hubble
15/03/2017
A Dark Winter Sky over Monfrag�e National Park in Spain
14/03/2017
At the Heart of Orion
12/03/2017
Reflections on vdB 31
11/03/2017
Dust, Gas, and Stars in the Orion Nebula
08/03/2017
NGC 2170: Still Life with Reflecting Dust
04/03/2017
Sivan 2 to M31
03/03/2017
The Tulip and Cygnus X-1
16/02/2017
The Calabash Nebula from Hubble
15/02/2017
The Rosette Nebula
14/02/2017
Melotte 15 in the Heart
10/02/2017
The Butterfly Nebula from Hubble
08/02/2017
NGC 6357: The Lobster Nebula
07/02/2017
Milky Way with Airglow Australis
03/02/2017
The Cat's Eye Nebula from Hubble
30/01/2017
N159 in the Large Magellanic Cloud
28/01/2017
M78 and Orion Dust Reflections
24/01/2017
The Elephant's Trunk Nebula in Cepheus
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19/01/2017
Geostationary Highway through Orion
Video
16/01/2017
Stardust in the Perseus Molecular Cloud
14/01/2017
IC 4406: A Seemingly Square Nebula
08/01/2017
Sharpless 249 and the Jellyfish Nebula
07/01/2017