This webpage has descriptions and animations from numerical simulations of colliding galaxies. Normal observation shows interacting galaxies apparently frozen in the midst of billion-year-long collisions. These movies...

Authored by Jurgen Geisen, this site has more than sixty-five Java applets. The interactive resources provide detailed solar and lunar data and the daily and annual path of the sun and moon for any location. More...

This site provides you with all the information you need to observe satellites such as the International Space Station and the Space Shuttle, spectacular events such as the dazzlingly bright flares from Iridium...

Hubble site this is a collection of all publicly released pictures from the Hubble Space Telescope. Accompanying each photograph is the official news release, an introduction to the object, fast facts, and related...

This web site from Michael Richmond at the Rochester Institute of Technology contains lecture notes for an introductory course on galaxies and cosmology. It is meant for a non-science audience with a limited background...