The Exploratorium
Create an apparatus for viewing sunspots, Search for extraterrestrial life, and see a live web cam of Mars.
The Space Place
Be able to name trees from space, find out why the sky is blue and discover how to shrink a building three different ways. Lots of online space Games, activities, and fun facts.
NASA Kids
Exactly how hot is the sun? Can astronauts sleep standing up? And is it possible to escape the Event Horizon of a black hole?