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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"
NGC 2359: Thor's Helmet
16/02/2019
The Helix Nebula in Hydrogen and Oxygen
13/02/2019
Moon, Four Planets, and Emu
08/02/2019
Fox Fur, Unicorn, and Christmas Tree
07/02/2019
Henize 70: A Superbubble in the LMC
04/02/2019
LDN 1622: Dark Nebula in Orion
02/02/2019
Sharpless 308: Star Bubble
31/01/2019
Orion over the Austrian Alps
23/01/2019
The Heart and Soul Nebulas
15/01/2019
Meteor and Milky Way over the Alps
14/01/2019
Tycho's Supernova Remnant in X-ray
13/01/2019
Milky Way Falls
12/01/2019
Vela Supernova Remnant Mosaic
10/01/2019
The Orion Nebula in Infrared from WISE
02/01/2019
The Witch Head Nebula
31/12/2018
The Great Carina Nebula
27/12/2018
NGC 6357: The Lobster Nebula
26/12/2018
Red Nebula, Green Comet, Blue Stars
20/12/2018
The Fairy of Eagle Nebula
02/12/2018
Across Corona Australis
29/11/2018
IC 1871: Inside the Soul Nebula
28/11/2018
Portrait of NGC 281
22/11/2018
The Tarantula Nebula
17/11/2018
The Cave Nebula in Hydrogen, Oxygen, and Sulfur
14/11/2018
The Lagoon Nebula is Stars, Gas, and Dust
12/11/2018
NGC 6188: The Dragons of Ara
07/11/2018
NGC 1499: The California Nebula
06/11/2018
IC 4592: The Blue Horsehead Reflection Nebula
05/11/2018
R Leporis: A Vampire's Star
31/10/2018
IC 59 and IC 63 in Cassiopeia
26/10/2018