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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"
At the Edge of the Helix
20/07/1997
Blue Stars and Red Pillars
18/07/1997
Doomed Star Eta Carinae
12/07/1997
Antares
24/06/1997
The Pipe Dark Nebula
21/06/1997
HH1/HH2: Star Jets
19/06/1997
Young Suns
11/06/1997
Tarantula Credit:
04/06/1997
The Heart Of Orion
23/05/1997
Shells in the Egg Nebula
20/05/1997
M42: A Mosaic of Orion's Great Nebula
11/05/1997
NGC 3242: The 'Ghost of Jupiter' Planetary Nebula Credit:
31/03/1997
Hale-Bopp Brighest Comet This Decade Credit:
13/03/1997
Comet Hale-Bopp and the Dumbbell Nebula Credit and Copyright:
20/02/1997
Shapley 1: An Annular Planetary Nebula Credit and Copyright:
15/02/1997
M1: Filaments of the Crab Nebula Credit and Copyright:
07/02/1997
Twistin' by the Lagoon
23/01/1997
From Eagle's EGGs A Star Is Born
19/01/1997
M16: Nebula With Star Cluster
18/01/1997
A Wolf-Rayet Star Blows Bubbles
03/01/1997
Nebula Nova Cygni Turns On
16/12/1996
Starburst Ring in Galaxy NGC 1317 Credit:
11/12/1996
Planetary Systems Now Forming in Orion Credit:
07/12/1996
Cocoon of a New White Dwarf Credit:
03/12/1996
Fliers Around the Blue Snowball Nebula Credit:
22/11/1996
The Blue Snowball Planetary Nebula Credit:
21/11/1996
Fractal Interstellar Dust Up-Close Credit and Copyright:
19/11/1996
Starbirth in the Lagoon Nebula Credit and Copyright:
24/10/1996
Proplyds: Infant Solar Systems?
17/10/1996
Bright Stars, Dim Galaxy
14/10/1996