BBC
Bb Ci Space: Solar System
Take a journey through the solar system with this interactive guide. Includes planetary history, "travel information," "tourist highlights," and video clips. Games and quizzes include a Solar System jigsaw that prompts the student to...
NASA
Nasa Space Place: What Is an Exoplanet?
Defines exoplanets and explains how astronomers go about looking for them.
NASA
Nasa: Space Place: Where Does Interstellar Space Begin?
Find out about interstellar space, and what characterizes this part of space outside of the heliosphere.