| Vocabulary Word | Definition |
| Solar System | the Sun and all the objects that orbit the sun |
| planet | a satellite of the Sun |
| Sun | a star that planet Earth orbits. The source of energy on Earth |
| Mercury | The planet closest to the Sun and the second smallest planet in our solar system |
| Venus | The second planet fromt he sun in our solar system |
| Earth | The planet we live on, third planet from the sun |
| Mars | the fourth planet from the sun, a reddish-colored planet |
| Jupiter | the fifth planet from the sun and the largest in our solar system |
| Saturn | the planet that is the largest in our solar system, sixth in distance from the sun, best known for its rings |
| Uranus | seventh planet from the Sun in our solar system |
| Neptune | The eight planet from the Sun in our solar system |
| Pluto | the farthestplanet from the Sun and the smallest planet in our solar system |
| moon | a satellite of Earth |
| rotation | to turn on an axis |
| revolve | to move in a circle around an object |
| satellite | an object that orbits another larger object in space |
| orbit | to revolve around an object |
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Ch.18 LTI-MA 509
