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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"
Sher 25: A Pending Supernova?
27/10/2001
Emission and Reflection in NGC 6559
23/10/2001
X-Ray Stars and Winds in the Rosette Nebula
19/10/2001
VDB 142 in Cepheus
11/10/2001
Hen 1357: New Born Nebula
06/10/2001
The Planetary Nebula Show
03/10/2001
IC 418: The Spirograph Nebula
30/09/2001
NGC 6992: A Glimpse of the Veil
28/09/2001
Elements of Nearby Spiral M33
27/09/2001
Molecular Cloud Barnard 68
23/09/2001
Southwest Andromeda
17/09/2001
Cold Dust in the Eagle Nebula
14/09/2001
X-Rays and the Circinus Pulsar
13/09/2001
NGC 3293: A Bright Young Open Cluster
09/09/2001
The Making of the Rotten Egg Nebula
03/09/2001
AFGL 2591: A Massive Star Acts Up
29/08/2001
The Lagoon Nebula in Three Colors
20/08/2001
Eagle EGGs in M16
12/08/2001
NGC 2440: Cocoon of a New White Dwarf
05/08/2001
Neighboring Galaxy: The Large Magellanic Cloud
04/08/2001
M57: The Ring Nebula
29/07/2001
The Red Spider Planetary Nebula
24/07/2001
NGC 1977: Blue Reflection Nebula in Orion
22/07/2001
The Elephant's Trunk in IC 1396
20/07/2001
Pulsar Wind in the Vela Nebula
19/07/2001
The Carina Nebula in Three Colors
17/07/2001
NGC 1850: Not Found in the Milky Way
12/07/2001
NGC 3132: The Eight Burst Nebula
24/06/2001
The Cygnus Loop
23/06/2001
Colorful Clouds Of Carina
17/06/2001