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Unit 3 Lesson 1
Historical model of solar system
| Term | Definition |
|---|---|
| Elliptical | using or involving ellipsis, especially so as to be difficult to understand. |
| Geocentric | earth centered |
| Gravitational force | he force of attraction between all masses in the universe; especially the attraction of the earth's mass for bodies near its surface; "the more remote the body the less the gravity"; "the gravitation between two bodies is proportional to the product of th |
| Heliocentric | sun centered |
| Moon | the natural satellite of the earth, visible (chiefly at night) by reflected light from the sun. |
| Orbit | the path that a body follows as it travels around another body in space |
| Planet | A relatively large spherical body that orbits a star |
| Solar system | The sun and all of the planets and other bodies that travel around it |
| Parallax | An apparent shift in the position of an object when viewed from different locations. |