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Planetary Nebula
An expanding shell of ionized gas ejected from a red giant star in the late stages of stellar evolution. Despite the name, it has no connection to planets. The glowing gas is illuminated by the hot core of the dying star.
Source: science.nasa.gov
APODs including "Planetary Nebula"
The Cat's Eye Nebula
27/12/2009
M57: The Ring Nebula
15/11/2009
Ring Nebula Deep Field
06/11/2009
The Butterfly Nebula from Upgraded Hubble
10/09/2009
Supernova Remnant E0102-72
05/09/2009
M97: The Owl Nebula
15/05/2009
A Halo for NGC 6164
07/05/2009
NGC 2392 Nebula from Hubble
03/05/2009
Stars Young and Old
26/03/2009
Thor's Helmet (NGC 2359) and Planetary Nebula
12/03/2009
The Helix Nebula from La Silla Observatory
03/03/2009
Planetary Nebula NGC 2818
22/01/2009
La Superba
18/12/2008
The Dumbbells
17/12/2008
M76 Above and Below
21/11/2008
A Bubble in Cygnus
13/11/2008
Exploring the Ring
18/09/2008
Spokes in the Helix Nebula
04/09/2008
NGC 7008: The Fetus Nebula
25/08/2008
X-Rays from the Cat's Eye Nebula
04/08/2008
IC 4406: A Seemingly Square Nebula
27/07/2008
M27: Not A Comet
26/06/2008
Curious Cometary Knots in the Helix Nebula
13/04/2008
Cat's Eye Hubble Remix
22/03/2008
A Beautiful Boomerang Nebula
28/12/2007
The Medusa Nebula
23/11/2007
NGC 3132: The Eight Burst Nebula
14/10/2007
NGC 7293: The Helix Nebula
03/08/2007
Cat's Eye Wide and Deep
29/06/2007
Monitoring M2-9
18/06/2007