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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 North America Nebula in Infrared
15/02/2011
The Rosette Nebula
14/02/2011
Star Colors in Orion
11/02/2011
NGC 2174: Stars Versus Mountains
09/02/2011
Hidden Treasures of M78
27/01/2011
The Rippled Red Ribbons of SNR 0509
25/01/2011
Alnitak, Alnilam, Mintaka
21/01/2011
Kona Galaxy Garden
18/01/2011
The Seagull Nebula
12/01/2011
The Cosmic Web of the Tarantula Nebula
11/01/2011
NGC 7293: The Helix Nebula
08/01/2011
Still Life with NGC 2170
30/12/2010
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