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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"
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
M76 Above and Below
21/11/2008
A Bubble in Cygnus
13/11/2008
The Cosmic Web of the Tarantula Nebula
11/11/2008
Our Galaxy's Central Molecular Zone
10/11/2008
Cygnus Trio
07/11/2008
A Sharper View of a Hazy Giant
06/11/2008
A Spectre in the Eastern Veil
01/11/2008
A Witch by Starlight
31/10/2008
Haunting the Cepheus Flare
30/10/2008
The North America Nebula
28/10/2008
Massive Stars in Open Cluster Pismis 24
26/10/2008
Amazing Comet Holmes
24/10/2008
Great Orion Nebulae
23/10/2008
A Dark Pulsar in CTA 1
21/10/2008
In the Center of the Lagoon Nebula
19/10/2008
Sharpless 171
18/10/2008
Camera Orion
15/10/2008