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Topic 10 Lesson 1
Solar System Objects
Term | Definition |
---|---|
solar system | Made up of the sun, the planets, their moons, and a variety of smaller objects. |
astronomical unit | A unit of distance equal to the average distance between Earth and the sun, about 150 million kilometers. |
sun | A gaseous body much larger than anything else in the solar system. |
planet | Round, orbits the sun, and has cleared out the region of the solar system along its orbit. |
moon | A natural satellite (a celestial body in orbit). |
asteroid | Small, mostly rocky bodies. |
meteoroids | Chunks of rock or dust smaller than asteroids. |
comets | Loose balls of ice and rock that usually have very long, narrow orbits. |