Earth science 22.1

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Earth science 22.1

  1. 1. Early Astronomy 22.1<br />
  2. 2. Astronomy <br />The scientific study of the universe; it includes the observation and interpretation of celestial bodies and phenomena.<br />
  3. 3. Geocentric<br />Describes the concept of an Earth—centered universe.<br />
  4. 4. Heliocentric<br />Describes the view that the sun is at the center of the solar system. <br />
  5. 5. Retrograde Motion <br />The apparent westward motion of the planets with respect to the stars. <br />
  6. 6. Ellipse <br />An oval.<br />
  7. 7. Astronomical Unit (AU)<br />Average distance from Earth to the sun; 1.5x10⁸ Kilometers.<br />
  8. 8. Key Concept<br />In the geocentric model, the moon, sun, and the known planets—Mercury, Venus, Mars, and Jupiter– orbit Earth.<br />
  9. 9. Key Concept<br />In the heliocentric model, Earth and the other planets orbit the sun.<br />
  10. 10. Key Concept<br />Copernicus concluded that Earth is a planet. He proposed a model of the solar system with the sun at the center.<br />
  11. 11. Key Concept<br />Brahe’s observations, especially of Mars, were far more precise than any made previously.<br />
  12. 12. Key Concept<br />Kepler discovered three laws of planetary motion.<br />
  13. 13. Key Concept<br />Galileo’s most important contributions were his descriptions of the behavior of moving objects.<br />
  14. 14. Key Concept<br />Although others had theorized the existence of such a force, Newton was the first to formulate and test the law of universal gravitation.<br />

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