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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"
Molecular Cloud Barnard 163
01/05/2011
The Dark Tower in Scorpius
27/04/2011
Hydrogen in the LMC
26/04/2011
Monsters of IC 1396
25/04/2011
The Cat's Eye Nebula from Hubble
24/04/2011
Visual Effects: Wonders of the Universe
18/04/2011
The Tadpoles of IC 410
16/04/2011
Messier 101
15/04/2011
Young Stars in the Rho Ophiuchi Cloud
14/04/2011
Planetary Nebula NGC 2438
07/04/2011
T Tauri and Hind's Variable Nebula
26/03/2011
MWC 922: The Red Square Nebula
23/03/2011
AE Aurigae and the Flaming Star Nebula
11/03/2011
NGC 6914 Nebulae
04/03/2011
NGC 1499: The California Nebula
02/03/2011
NGC 1999: South of Orion
24/02/2011
Milky Way Over Switzerland
21/02/2011
Planetary Nebula Project
18/02/2011
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