| Term | Definition |
|---|
| Inner Planets | The four planets closest to the sun. |
| Outer Planets | The five planets farthest from the sun. |
| Jupiter | the fifth planet from the sun. |
| Mercury | The planet closest to the sun. |
| Space probe | A vehicle sent into space to explore places too dangerous for people. |
| Saturn | A planet known for its beautiful rings. |
| Earth | the third planet from the sun, has one moon and is made up mainly of water. |
| asteroid | A piece of rock that orbits the sun between Mars and Jupiter |
| phases | the moon seems to have different shapes because it goes through________. |
| Venus | About the same size as Earth |
| gas giants | Jupiter, Saturn, Uranus and Neptune |
| solar system | A group of planets and their moons that orbit a central star. |
| axis | An imaginary line around which a planet rotates, or spins. |
| revolution | A year is the time it takes Earth to make one___________. |
| comet | a space object made of ice, dust, and gases. |
| Sun | A star made up of gases and gives energy to the solar system. |
| Inner Planets | Mercury Venus Earth Mars |
| Outer planets | Jupiter, Saturn, Uranus, Neptune, and Pluto |
| rotation | A day is the time it takes Earth to make one ________________. |
| orbit | the path a planet takes around the sun. |
| satellite | any object orbiting another. |
| telescope | an instrument used to observe distant objects. |
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