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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 Starry Night in Brazil
09/05/2009
A Halo for NGC 6164
07/05/2009
NGC 2392 Nebula from Hubble
03/05/2009
Dark Markings of the Sky
25/04/2009
Sharpless 308
23/04/2009
NGC 1333 Stardust
18/04/2009
The Big Picture
11/04/2009
In the Heart of the Tarantula Nebula
31/03/2009
The Seagull Nebula
27/03/2009
Stars Young and Old
26/03/2009
The Seahorse of the Large Magellanic Cloud
23/03/2009
Thor's Helmet (NGC 2359) and Planetary Nebula
12/03/2009
Horsehead and Orion Nebulae
10/03/2009
IC 5146: The Cocoon Nebula
05/03/2009
The Helix Nebula from La Silla Observatory
03/03/2009
Barnard's Loop around the Horsehead Nebula
24/02/2009
Orion Nebula: The Hubble View
22/02/2009
Snake in the Dark
20/02/2009
Mauna Kea Milky Way Panorama
19/02/2009
The Great Carina Nebula
16/02/2009
IC 1805: The Heart Nebula
14/02/2009
Zodiacal Light Vs. Milky Way
12/02/2009
Orion's Belt Continued
11/02/2009
Orion's Belt
10/02/2009
Inside the Eagle Nebula
08/02/2009
NGC 604: X-rays from a Giant Stellar Nursery
05/02/2009
NGC 1579: Trifid of the North
30/01/2009
AE Aurigae and the Flaming Star Nebula
26/01/2009
The Bubble Nebula
24/01/2009
Planetary Nebula NGC 2818
22/01/2009