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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"
South of Orion
03/04/2008
The N44 Complex
27/03/2008
The NGC 3576 Nebula
26/03/2008
Molecular Cloud Barnard 68
23/03/2008
Cat's Eye Hubble Remix
22/03/2008
Where is HD 189733?
21/03/2008
M78 and Reflecting Dust Clouds in Orion
18/03/2008
Sculpting the South Pillar
13/03/2008
Comet over California
07/03/2008
Vela Supernova Remnant
06/03/2008
NGC 6334: The Cat's Paw Nebula
04/03/2008
The Eagle Nebula in Hydrogen, Oxygen, and Sulfur
27/02/2008
Orion's Horsehead Nebula
21/02/2008
M1: The Crab Nebula from Hubble
17/02/2008
Long Stem Rosette
14/02/2008
Echoes from RS Pup
12/02/2008
Andromeda Island Universe
24/01/2008
Thor's Emerald Helmet
17/01/2008
The Cocoon Nebula from CFHT
14/01/2008
Polaris Dust Nebula
11/01/2008
M51: Cosmic Whirlpool
05/01/2008
A Year of Spectacular Comets
31/12/2007
A Beautiful Boomerang Nebula
28/12/2007
Trifid Pillars and Jets
26/12/2007
Mars and Orion Over Monument Valley
25/12/2007
Emission Nebula IC 1396
24/12/2007
Horizon to Horizon
21/12/2007
Reflections on the 1970s
20/12/2007
Mountains of Creation
15/12/2007
T Tauri and Hind's Variable Nebula
13/12/2007