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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"
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
IC 410 and NGC 1893
17/01/2009
NGC 2170: Celestial Still Life
14/01/2009
NGC 2736: The Pencil Nebula
08/01/2009
Thackeray's Globules
28/12/2008
Crab Pulsar Wind Nebula
27/12/2008
The Elephant's Trunk in IC 1396
26/12/2008
Fox Fur, a Unicorn, and a Christmas Tree
25/12/2008
The Large Cloud of Magellan
19/12/2008
La Superba
18/12/2008
The Dumbbells
17/12/2008
Orion Dawn Over Mount Nemrut
16/12/2008
Portrait of NGC 281
10/12/2008
M45: The Pleiades Star Cluster
09/12/2008
The Dark Doodad Nebula
08/12/2008
Massive Stars Resolved in the Carina Nebula
01/12/2008
Chilean Skyscape
29/11/2008
The Horsehead Nebula in Orion
26/11/2008
In the Vicinity of the Cone Nebula
23/11/2008