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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"
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
A Close-Up of the Horsehead Nebula Credit and Copyright:
05/10/1996
Orion's Horsehead Nebula Credit:
02/10/1996
Exploring The Universe With IUE 1978-1996 Credit:
30/09/1996
Bright Stars and Dark Clouds Credit:
25/09/1996
The High Energy Crab Nebula
09/09/1996
The Pleiades Star Cluster
03/09/1996
M17: The Majestic Swan Nebula
29/08/1996
NGC 5882: A Small Planetary Nebula
28/08/1996
A Wolf-Rayet Star Bubble
26/08/1996
NGC 3293: A Bright Young Open Cluster
23/08/1996
A Close-Up of the Lagoon's Hourglass
21/08/1996
A Close-Up of the Lagoon Nebula
20/08/1996
NGC 604: Giant Stellar Nursery in M33
16/08/1996
The Snake Nebula in Ophiuchus
11/08/1996
The Cygnus Loop
26/07/1996
Hale-Bopp, Jupiter, and the Milky Way
23/07/1996
Nebulosity in Sagittarius
18/07/1996