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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 Annotated Galactic Center
29/12/2001
Starlight Reflections
28/12/2001
The Incredible Expanding Crab
27/12/2001
Hot Stars in the Southern Milky Way
22/12/2001
The Horsehead Nebula
16/12/2001
NGC 7023: The Iris Nebula
14/12/2001
A Sky Filled with Leonids
05/12/2001
AE Aurigae: The Flaming Star
04/12/2001
M16: Stars from Eagle's EGGs
25/11/2001
Bright Stars, Dim Galaxy
03/11/2001
Halloween and the Ghost Head Nebula
31/10/2001
NGC 2346: A Butterfly-Shaped Planetary Nebula
28/10/2001
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