The small amount of remaining material swirled into a disk. Some of it crashed together and formed planets. That's the main theory and though most scientists think that's how it happened.

Most scientists suspect there are many other solar systems like ours. And as of late, they had found nearly two dozen other planets orbiting faraway stars. None of them appear to have the right conditions to support life, though.

Ideas:

1. Build a scale model of our solar system.
2. Explain the forces at work when the planets orbit the sun. What keeps them in place? Are they moving farther away?
3. Study pictures from telescopes. Show the different planets in the pictures and their moons.
4. What are the features of the planets? Could they support some kind of life? Why or why not?