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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"
The Orion Nebula from VLT
30/01/2001
Spherical Planetary Nebula Abell 39
23/01/2001
X-rays From The Cat's Eye
11/01/2001
M8: In the Center of the Lagoon Nebula
03/01/2001
The Dark Horsehead Nebula
29/12/2000
M2-9: Wings of a Butterfly Nebula
17/12/2000
IC443's Neutron Star
15/12/2000
Composing the Omega Nebula
11/12/2000
The Orion Nebula in Hydrogen
22/11/2000
A 2000 Leonid Through Orion
20/11/2000
The First Lunar Observatory
11/11/2000
The Gum Nebula Supernova Remnant
07/11/2000
Heaven on Earth
06/11/2000
The Nebula And The Neutron Star
25/10/2000
N81: Star Cradle in the SMC
05/10/2000
M16: Stars from Eagle's EGGs
24/09/2000
M17: Omega Nebula Star Factory
19/09/2000
Andromeda Island Universe
08/09/2000
IC 418: The Spirograph Nebula
07/09/2000
The Brown Dwarfs of Orion's Trapezium
30/08/2000
The Helix Nebula from CFHT
28/08/2000
Orion's Horsehead Nebula
27/08/2000
NGC 6960: The Witch's Broom Nebula
23/08/2000
NGC 2244: A Star Cluster in the Rosette Nebula
22/08/2000
Doomed Star Eta Carinae
13/08/2000
M15: Dense Globular Star Cluster
04/08/2000
At the Edge of the Crescent Nebula
02/08/2000
NGC 2440: Cocoon of a New White Dwarf
30/07/2000
M57: The Ring Nebula
16/07/2000
The Crab Nebula in Blue and White
11/07/2000