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stars and planets
| Term | Definition |
|---|---|
| axis: | an imaginary line that runs through the center of earth from the north pole to the south pole |
| rotate: | to spin around axis |
| revolve: | to travel in a closed path around the sun |
| orbit: | an objects path in space around another object |
| moon: | a small planet-like body that revolves around the earth rather than the sun |
| phases: | as the moon revolves around earth, different amounts of its lit surface can be seen |
| solar system: | in 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 rocks, ice and frozen gases |
| star: | a huge ball of super-heated gases |
| sun: | a star that is at the center of our solar system |
| constellation: | a group of stars that form an imaginary image in the sky |
| galaxy: | a huge system of gases dust and stars |
| universe: | everything that exists in space |
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