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Unformatted text preview: planets? Kepler a. Studied Brahes Data b. Developed laws of planetary motion c. Keplers law a. First Law Planets move in elliptical orbits and speed up as they approach the sun. b. 2 nd law A line from the planet to the sun sweeps out equal areas in equal times c. 3 rd law -- The time a planet takes to orbit is related to its distance from the sun; it means that planet far from the sun orbit more slowly Galileo a. Telescope, b. He observed a. Spots on the sun (sun spots) b. Mountains on the moon c. The phases of Venus d. Moons orbiting Jupiter c. Book published in 1632: dialogue concerning the two chief world systems...
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- Spring '07