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stars and planets
| Term | Definition |
|---|---|
| Rotate: | To spin around an axis. |
| Axis: | An imaginary line that runs through the center of earth from the north pole to the south pole. |
| Revolve: | to travel in a closed path around the sun. |
| Orbit: | An object's path in space around another object. |
| Moon: | A small planet-like body that revolves around earth rather than the sun. |
| phases: | As the moon revolves around earth, some of its lit surface can be seen. |
| Solar system: | Is a group of objects in space that orbit a star in the center plus the star itself. |
| Planet: | Is a large object that revolves around a star in a clear orbit. |
| Dwarf planet: | also revolves around a star, but its path is not clear of other objects. |
| Comet: | a ball of rock, ice and frozen gases. |
| star: | A huge ball of superheated gases. |
| sun: | A star that is at the center of our solar system. |
| Constellation: | A group of stars that form an imaginary picture in the sky. |
| Galaxy: | A huge system of gases, dust, and stars. |
| Universe: | Everything that exists in space. |
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