Model of the Solar System

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Presentation transcript:

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 -Accepted for over 2000 years -Planets is greek for ‘wanderers’

Geocentric Model Problem: -Retrograde motion: the apparent backwards motion of planets as a faster orbiting planet passes it. How did we overcome this??

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

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

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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