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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"
Messiers and Mars
15/06/2001
The Pulsar Powered Crab
02/06/2001
NGC 6826: The Blinking Eye
26/05/2001
The Pleiades Star Cluster
06/05/2001
Protoplanetary Survivors in Orion
04/05/2001
Horsehead Rides Again
26/04/2001
Space Laser Creates Artificial Star
25/04/2001
NGC 2264: Stars, Dust, and Gas
24/04/2001
Diffraction Spikes: When Stars Look Like Crosses
15/04/2001
New Stars Destroying NGC 1748
03/04/2001
The Crab Nebula from VLT
25/03/2001
Jupiter, Saturn and Messier 45
22/03/2001
M27: The Dumbbell Nebula
06/03/2001
Infrared Horsehead
24/02/2001
Star Forming Region S106
20/02/2001
Star Forming Region Hubble-X
16/02/2001
The Rosette Nebula
14/02/2001
Planetary Nebula Mz3: The Ant Nebula
05/02/2001
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