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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"
A Telescope Laser Creates an Artificial Star
07/02/2005
NGC 3132: The Eight Burst Nebula
06/02/2005
NGC 2467: From Gas to Stars
31/01/2005
NGC 6946: The Fireworks Galaxy
25/01/2005
NGC 2440: Cocoon of a New White Dwarf
23/01/2005
NGC 346 in the Small Magellanic Cloud
18/01/2005
Nebula Nova Cygni Turns On
16/01/2005
Infrared Trifid
13/01/2005
Dust Sculptures in the Rosette Nebula
10/01/2005
UKIRT: Aloha Orion
06/01/2005
Milky Way Illustrated
04/01/2005
The Pleiades Star Cluster
03/01/2005
The Helix Nebula from Blanco and Hubble
29/12/2004
Tentacles of the Tarantula Nebula
28/12/2004
3C58: Pulsar Power
23/12/2004
Comet, Meteor, Nebula, Star
22/12/2004
Molecular Cloud Barnard 68
19/12/2004
In the Center of the Heart Nebula
08/12/2004
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