Windows to the Universe Kids Space

http://www.windows.ucar.edu/

Information for beginners, intermediate, and advanced astronomy lovers.  Good astronomy facts presented in a fun and appealing way.

NASA - NASA Kids Club or NASA for Students

http://www.nasa.gov/audience/forkids/kidsclub/flash/index.html 

http://www.nasa.gov/audience/forstudents/index.html
 

Play astronomy games for all levels of learners at NASA Kids Club and learn and research at NASA for Students.  So much to do and view here, it's out of this world!