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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"
Pelican Nebula Ionization Front
03/07/2000
M63: The Sunflower Galaxy
27/06/2000
Shapley 1: An Annular Planetary Nebula
25/06/2000
The Milky Way Near the Southern Cross
18/06/2000
The Carina Nebula in Infrared
13/06/2000
Vela Pulsar: Neutron Star-Ring-Jet
09/06/2000
MyCn18: An Hourglass Nebula
04/06/2000
Antares and Rho Ophiuchi
21/05/2000
The Heart Of Orion
06/05/2000
The North America Nebula
01/05/2000
Reflection Nebula M78
24/04/2000
IC 4406: A Seemingly Square Nebula
16/04/2000
The Local Bubble and the Galactic Neighborhood
12/04/2000
Celebrating Hubble With NGC 6751
07/04/2000
Eagle EGGs in M16
02/04/2000
Free-Floating Planets In Orion
31/03/2000
M20: The Trifid Nebula
28/03/2000
A Panorama of Oddities in Orion A
13/03/2000
Messier Marathon
11/03/2000
The Pipe Dark Nebula
05/03/2000
NGC 1999: Reflection Nebula in Orion
02/03/2000
The Pleiades Star Cluster
27/02/2000
Neighboring Galaxy: The Large Magellanic Cloud
22/02/2000
Young Suns
19/02/2000
X-Ray Stars Of Orion
04/02/2000
Colorful Clouds Of Carina
03/02/2000
NGC 2392 from the Newly Fixed Hubble
24/01/2000
NGC 7635: The Bubble Nebula
18/01/2000
The Rosette Nebula in Hydrogen, Oxygen, and Sulfur
11/01/2000
The Century that Defined Galaxy
30/12/1999