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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 Light, the Dark, and the Dusty
11/06/2015
The Milky Way over the Temple of Poseidon
08/06/2015
NGC 3132: The Eight Burst Nebula
07/06/2015
Messier Craters in Stereo
30/05/2015
NGC 7822 in Cepheus
23/05/2015
A Dark and Dusty Sky
22/05/2015
NGC 2440: Pearl of a New White Dwarf
17/05/2015
The Magnificent Horsehead Nebula
13/05/2015
MyCn18: An Hourglass Planetary Nebula
10/05/2015
M51: The Whirlpool Galaxy
02/05/2015
Planetary Nebula Mz3: The Ant Nebula
26/04/2015
Colorful Star Clouds in Cygnus
22/04/2015
M46 Plus Two
17/04/2015
Mystic Mountain Dust Pillars
15/04/2015
NGC 3293: A Bright Young Star Cluster
06/04/2015
Orion Spring
26/03/2015
The Clouds of Orion the Hunter
16/03/2015
Along the Cygnus Wall
12/03/2015
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