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unit 3 lesson 1
historical models
Term | Definition |
---|---|
elliptical | using or involving ellipsis, especially so as to be difficult to understand. |
geocentric | describes something that uses Earth as the reference point |
gravitational force | t any two bodies in the universe attract each other with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. |
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 relativley 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 objectvwhen viewed from different locations |