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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"
Reflecting Merope
04/12/2004
Doomed Star Eta Carinae
28/11/2004
What the Hubble Saw
25/11/2004
NGC 7023: The Iris Nebula
04/11/2004
Spooky Star Forming Region DR 6
01/11/2004
Halloween and the Ghost Head Nebula
31/10/2004
Inside the Eagle Nebula
24/10/2004
NGC 281: Cluster, Clouds, and Globules
20/10/2004
IC 418: The Spirograph Nebula
17/10/2004
N11: A Giant Ring of Emission Nebulas
06/10/2004
NGC 6823: Cloud Sculpting Star Cluster
04/10/2004
Comet Hale-Bopp and the North America Nebula
03/10/2004
The Great Nebula in Orion
27/09/2004
M24: A Sagittarius Starscape
21/09/2004
IC 1805: Light from the Heart
17/09/2004
Cat's Eye
10/09/2004
Sagittarius Triplet
09/09/2004
The Large Cloud of Magellan
02/09/2004
M17: A Hubble Close-Up
28/08/2004
Windblown N44F
19/08/2004
Close-Up of the Lagoon
16/08/2004
The Dark River to Antares
09/08/2004
Emission Nebula IC 1396
05/08/2004
A Cygnus Starfield
28/07/2004
The Bubble
16/07/2004
Stars and Dust in Corona Australis
15/07/2004
Orion Nebula in Oxygen, Hydrogen, and Sulfur
13/07/2004
Ringed Nebulae
09/07/2004
N11B: Star Cloud of the LMC
07/07/2004
M57: The Ring Nebula
04/07/2004