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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"
NGC 602 in the Flying Lizard Nebula
07/03/2015
Cometary Globule CG4
06/03/2015
Pillars and Jets in the Pelican Nebula
04/03/2015
Long Lovejoy and Little Dumbbell
27/02/2015
The Rosette Nebula in Hydrogen and Oxygen
25/02/2015
The Milky Way Over the Arizona Toadstools
23/02/2015
The Dark River to Antares
22/02/2015
Carina Nebula Dust Pillar
08/02/2015
Comet Lovejoy in a Winter Sky
28/01/2015
Infrared Orion from WISE
19/01/2015
The Hunter, the Bull, and Lovejoy
14/01/2015
The Soap Bubble Nebula
13/01/2015
Stars and Dust in Corona Australis
08/01/2015
Hubble 25th Anniversary: Pillars of Creation
07/01/2015
A Fox Fur, a Unicorn, and a Christmas Tree
05/01/2015
At the Heart of Orion
02/01/2015
Vela Supernova Remnant
01/01/2015
Observatory, Mountains, Universe
30/12/2014
IC 1795: The Fishhead Nebula
24/12/2014
Reflections on the 1970s
19/12/2014
NGC 7331 and Beyond
18/12/2014
W5: Pillars of Star Formation
16/12/2014
Molecular Cloud Barnard 68
14/12/2014
The Flame Nebula in Visible and Infrared
09/12/2014
Sharpless 249 and the Jellyfish Nebula
03/12/2014
Eta Carinae and the Expanding Homunculus Nebula
02/12/2014
Stars and Dust Pillars in NGC 7822 from WISE
01/12/2014
The Seahorse of the Large Magellanic Cloud
30/11/2014
Portrait of NGC 281
28/11/2014
The Creature from the Red Lagoon
25/11/2014