The document provides an overview of the solar system, including definitions of key terms like revolve, rotate, orbit, and differences between inner and outer planets. It notes that inner planets are smaller and rocky while outer planets are larger and gaseous. The document also describes some of the key characteristics of planets like Mercury, Venus, Earth, Mars, and properties of Earth's moon.

1. Solar System By: William Meng

2. Revolve? Revolve means for a smaller object to move around a larger object. Planets revolve around the sun.

3. Rotation Rotate is similar to spinning. When a planet rotates, its spins itself on its axis. The Earth Rotates

4. Difference between Inner and Outer Planets Inner planets are inside asteroid belt, Outer planets are outside of asteroid belt. Inner planets are smaller than outer planets Inner planets are mostly made of rock, outer planets are mostly made of gas.

5. Craters in inner planets? There are more craters in the inner planets because sun’s gravity attracts asteroids from the asteroid belts to the inner planets.

6. Orbit Orbit is the path a planet/satellite follows when it revolves around a larger object. This Satellite orbits around the sun.

7. A Planet A planet needs to have: Large enough so the gravity is strong enough to make the planet round Orbits around the sun Cleared out its path

8. Dwarf Planet A dwarf planet is similar to a planet. It is large enough so the gravity is strong enough to make the planet round and orbits around the sun But it has not yet cleared its path

9. The 13 planets?

10. Solar System Picture

11. Mercury Mercury is the closest planet to the sun Helium and sodium are found on its atmosphere. Impact cratering, volcanism, and tectonic activity shaped Mercury. Has a very thin atmosphere because its gravity is too weak.

12. Venus

13. Earth

14. The Moon Moon. Earth’s only satellite and companion

15. Mars