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ch17 space
| Term | Definition |
|---|---|
| The sun and all the bodies that orbit it | solar system |
| 1 full orbit of an object around another object | revolution |
| 1 whole spin of an object on its axis | rotation |
| an object in orbit around another object | satellite |
| a spacecraft that gathers data without a crew | space probe |
| an imaginary center line around which the earth rotates | axis |
| a frozen mass of ice and dust orbiting the sun | comet |
| a rocky mass up to several hundred kilometers wide that revolves the sun | asteroid |
| an induction of the fraction of the moon that is illuminated as seen from earth | moon phase |