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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"
Sideways Orion Over Snowy Ireland
26/12/2010
Decorating the Sky
25/12/2010
A Lunar Eclipse on Solstice Day
20/12/2010
North America and the Pelican
18/12/2010
Flame Nebula Close-Up
26/11/2010
Stardust in Aries
25/11/2010
A Massive Star in NGC 6357
21/11/2010
Nebulae in the Northern Cross
19/11/2010
Sisters of the Dusty Sky
18/11/2010
NGC 7023: The Iris Nebula
12/11/2010
The Elephant's Trunk in IC 1396
06/11/2010
The Necklace Nebula
03/11/2010
Halloween and the Ghost Head Nebula
31/10/2010
Ghost of the Cepheus Flare
30/10/2010
Orion: Head to Toe
23/10/2010
NGC 7822 in Cepheus
22/10/2010
Methuselah Nebula MWP1
21/10/2010
NGC 346 in the Small Magellanic Cloud
17/10/2010
The Large Cloud of Magellan
16/10/2010
Vista with NGC 2170
15/10/2010
Clusters, Hartley, and the Heart
14/10/2010
Pacman and Hartley
07/10/2010
Horsehead and Orion Nebulas
05/10/2010
Hubble's Lagoon
02/10/2010
Coreshine from a Dark Cloud
30/09/2010
Melotte 15 in the Heart
25/09/2010
Dark Clouds of the Carina Nebula
19/09/2010
The Veil Nebula
16/09/2010
An Extraordinary Spiral from LL Pegasi
14/09/2010
Vela Supernova Remnant
10/09/2010