Here are some great sites for info, pictures, animations, etc., on space,
space craft, current projects and other neat stuff.
The first site will tell you how much you would weigh on other planets.
The second one posts a new astronomy picture (with links) each day. I've
been getting some great wallpaper for my computer at work...

http://www.exploratorium.edu/ronh/weight/

http://antwrp.gsfc.nasa.gov/apod/astropix.html

http://www.spacescience.org/

http://www.jpl.nasa.gov/

http://www.esa.int/esaCP/index.html