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Model of the Solar System

Model of the Solar System. Who is This Greek Guy?. Two models of the Solar System. Aristotle Lived more than 2000 years ago in Greece -Geocentric Model: -Earth is the centre of the solar system and all other bodies rotate around it -Earth was stable and motionless

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Model of the Solar System

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  1. Model of the Solar System

  2. Who is This Greek Guy?

  3. Two models of the Solar System • Aristotle • Lived more than 2000 years ago in Greece -Geocentric Model: -Earth is the centre of the solar system and all other bodies rotate around it -Earth was stable and motionless -Accepted for over 2000 years -Planets is greek for ‘wanderers’

  4. Geocentric Model Problem: -Retrograde motion: the apparent backwards motion of planets as a faster orbiting planet passes it. - Ex. Earth travels around the Sun faster than Mars How did we overcome this??

  5. A solution was found by Ptolemy: -Who lived around 140 AD -he proposed the idea of epicycles (small circles) on the planetary orbits and these explained retrograde motion

  6. But there was a problem with Ptolemy’s epicycles: -very complicated; still not accurate in predicting planet positions

  7. Nicolaus Copernicus (Late 1400’s): - Heliocentric Model: Sun centered model of the solar system

  8. Kepler • A mathematician • Made model more accurate by finding that orbits were ellipses rather than circles Problems: - no knowledge of gravity; still not accurate in predicting planet positions.

  9. Clinching Evidence: • Galileo (1609) • Developed a telescope • Saw moons orbiting Jupiter • Newton (1667) - developed laws of motion and gravity based on Kepler’s work and which are true for earthly and celestial bodies

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