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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 2392 from Hubble
07/04/2002
An Unusual Globule in IC 1396
25/03/2002
The Cat's Eye Nebula
24/03/2002
NGC 2244: A Star Cluster in the Rosette Nebula
17/03/2002
LL Orionis: When Cosmic Winds Collide
13/03/2002
M27: Not A Comet
02/03/2002
A Radio Vista of Cygnus
18/02/2002
The Local Bubble and the Galactic Neighborhood
17/02/2002
The Great Nebula in Orion
13/02/2002
Reflection Nebula M78
11/02/2002
The Southern Sky in Warm Hydrogen
29/01/2002
Local Group Galaxy NGC 6822
23/01/2002
Thackeray's Globules
08/01/2002
The Mysterious Cone Nebula
07/01/2002
M2-9: Wings of a Butterfly Nebula
06/01/2002
M16: Infrared Star Hunt
04/01/2002
M16: Stars, Pillars, and the Eagle's EGGs
03/01/2002
Trifid Pillars & Jets
30/12/2001
The Annotated Galactic Center
29/12/2001
Starlight Reflections
28/12/2001
The Incredible Expanding Crab
27/12/2001
Hot Stars in the Southern Milky Way
22/12/2001
The Horsehead Nebula
16/12/2001
NGC 7023: The Iris Nebula
14/12/2001
A Sky Filled with Leonids
05/12/2001
AE Aurigae: The Flaming Star
04/12/2001
M16: Stars from Eagle's EGGs
25/11/2001
Bright Stars, Dim Galaxy
03/11/2001
Halloween and the Ghost Head Nebula
31/10/2001
NGC 2346: A Butterfly-Shaped Planetary Nebula
28/10/2001