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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 2440: Cocoon of a New White Dwarf
05/08/2001
Neighboring Galaxy: The Large Magellanic Cloud
04/08/2001
M57: The Ring Nebula
29/07/2001
The Red Spider Planetary Nebula
24/07/2001
NGC 1977: Blue Reflection Nebula in Orion
22/07/2001
The Elephant's Trunk in IC 1396
20/07/2001
Pulsar Wind in the Vela Nebula
19/07/2001
The Carina Nebula in Three Colors
17/07/2001
NGC 1850: Not Found in the Milky Way
12/07/2001
NGC 3132: The Eight Burst Nebula
24/06/2001
The Cygnus Loop
23/06/2001
Colorful Clouds Of Carina
17/06/2001
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