Vocabulary #8 (The inner Solar System)

Definitions:

1. planet: a large body orbiting a star, such as the Sun
2. solar system: a star, such as the Sun, and all the objects orbiting it
3. asteroid: a rocky, metallic object that orbits the sun
4. Kepler's laws: laws that summarize the movement of the planets

Sentences and illustrations:

1. We can detect planets from the sunlight reflected off them.

2. The solar system is the Sun and all of the planets, moons, and other bodies travel around it.

3. Asteroids are too small to be considered planets.

4. The astronomer Johannes Kepler stated three laws that summarize the motion of planets (Kepler's Laws).