Links for planetary nebulae

http://www.seds.org/messier/planetar.html
http://fusedweb.pppl.gov/CPEP/Chart_Pages/5.Plasmas/Nebula/Planetary.html
http://www.astro.washington.edu/balick/WFPC2/
http://ad.usno.navy.mil/pne/gallery.html
http://www.blackskies.org/

APOD 3.6-Galaxies away

The group of galaxies pictured here are about 45o million light years away from where you are sitting right now. This is a galaxy cluster known as Abell SO740.
This image captures numerous galaxies, the biggest being the elliptical galaxy ESO 325-G004. This giant galaxy spans over 100000 light years and has over a 100 billion stars. It is comparable in size to our own galaxy.

Apod3.5- Thor's Helmet

This is a picture of NGC 2359, a striking emission nebulae. It is nicknamed Thor's helmet. This bubble nebulae is 30 light years across and is blown by energetic winds from a very hot star in the center. This star is known as a Wolf-Rayet star, a rare massive blue giant which develops tremendous winds that go at millions of kilometers per hour.