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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 7009: The Saturn Nebula
30/12/1997
M2-9: Wings of a Butterfly Nebula
23/12/1997
NGC 6826: The Blinking Eye
19/12/1997
The Trifid Nebula in Red, White and Blue
08/12/1997
Orion: The Big Picture
01/12/1997
Diffraction Spikes: When Stars Look Like Crosses
19/11/1997
In the Center of the Trapezium
18/11/1997
The Annotated Galactic Center
11/11/1997
Orion's Horsehead Nebula
25/10/1997
Moving Echoes Around SN 1987A
24/10/1997
The Butterfly Planetary Nebula
21/10/1997
Spiral Eddies On Planet Earth
20/10/1997
The Pleiades Star Cluster
18/10/1997
Cold Wind From The Boomerang Nebula
15/10/1997
Hale-Bopp and the North American Nebula
09/10/1997
The Brightest Star Yet Known
08/10/1997
In the Center of 30 Doradus
04/10/1997
Colliding Supernova Remnants
02/10/1997
A Wolf Rayet Star Bubble
28/09/1997
Antares and Rho Ophiuchi
22/09/1997
MyCn18: An Hourglass Nebula
14/09/1997
Infrared Helix
01/09/1997
Infrared Trifid
28/08/1997
The Snake Nebula in Ophiuchus
24/08/1997
Sher 25: A Pending Supernova?
12/08/1997
Nebulosity in Sagittarius
10/08/1997
The Cygnus Loop
03/08/1997
The Cat's Eye Nebula
02/08/1997
Eagle Castle
30/07/1997
In the Center of the Keyhole Nebula
21/07/1997