Sites about the... Universe
The universe is a big place and even though satellites are up there and much research has gone into space travel, people still know relatively little about the universe. Check out some of the links below and keep an open mind as you can never be sure about anything unless you've been there!
Stellarium Web Online Star Map (A planetarium running in your web browser that shows a realistic star map to explore, just like what you see with the naked eye, binoculars or a telescope.)
Hands On Universe
NASA's High-Energy Astrophysics Learning Centre
The Astronomical Society (Universe in the Classroom)