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Spaceship Earth
| Term | Definition |
|---|---|
| axis | The imaginary line around which Earth rotates. |
| constellation | A pattern of stars that forms an imaginary picture or design in the sky. |
| gravity | A force that pulls things toward the center of Earth. |
| hemisphere | One half of Earth. |
| orbit | The path of one object in space around another object. |
| revolution | The movement of Earth one time around the sun. |
| rotation | The turning of Earth on its axis. |