NASA
Nasa: What Is a Planet?
This lesson teaches students about the characteristics of planets, comets, asteroids, and trans-Neptunian objects. After learning about these different things, students then are to debate about a new object that is found in space.
Cosmos 4 kids
Cosmos4 Kids: Solar System Details: Kuiper Belt
Explore space beyond Pluto in the Kuiper Belt region of our solar system. Find out about the space bodies that exist there and what our space missions have taught us about this far away region.