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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"
Planetary Nebula Abell 78
16/10/2020
The Colorful Clouds of Rho Ophiuchi
14/10/2020
Milky Way over the Pinnacles in Australia
11/10/2020
Ou4: A Giant Squid in a Flying Bat
07/10/2020
Orion Nebula in Oxygen, Hydrogen, and Sulfur
04/10/2020
Sonified: Eagle Nebula Pillars
Video
30/09/2020
Filaments of the Cygnus Loop
28/09/2020
Arp 78: Peculiar Galaxy in Aries
18/09/2020
M2-9: Wings of a Butterfly Nebula
13/09/2020
The Milky Way over St Michael's Mount
07/09/2020
M1: The Crab Nebula from Hubble
06/09/2020
The Wizard Nebula
04/09/2020
NGC 6357: Cathedral to Massive Stars
30/08/2020
The Valley of Orion
28/08/2020
Cygnus Skyscape
26/08/2020
The Helix Nebula from Blanco and Hubble
23/08/2020
Unwinding M51
21/08/2020
NGC 5189: An Unusually Complex Planetary Nebula
14/08/2020
The Pipe Nebula
07/08/2020
Messier 20 and 21
06/08/2020
NGC 2442: Galaxy in Volans
04/08/2020
The Elephant's Trunk Nebula in Cepheus
01/08/2020
NGC 6188: The Dragons of Ara
28/07/2020
Iron in the Butterfly Nebula
21/07/2020
Comet NEOWISE and Nebulae
20/07/2020
M43: Dust, Gas, and Stars in the Orion Nebula
06/07/2020
Lynds Dark Nebula 1251
03/07/2020
Bright Planetary Nebula NGC 7027 from Hubble
30/06/2020
The Tadpoles of IC 410
18/06/2020
NGC 2359: Thor's Helmet
12/06/2020