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SPACE SCIENCE UNIT 2 LESSON 1 Solar system – the sun and all of the bodies that orbit it Models of the solar system 1. Heliocentric – the sun is the center of our solar system 2. Geocentric – the earth is the center of our solar system Aristotle – Greek philosopher • Geocentric model • Parallax Aristarchus – Greek Astronomer • Heliocentric • Not widely accepted Ptolemy – Egyptian Astronomer • Geocentric • Orbits perfect circle Copernicus – Polish Astronomer • Heliocentric • Orbits perfect circles Brahe – Danish Astronomer • 20 years of observations of the planets Kepler – German Astronomer • Heliocentric • 3 laws of planetary motion – 1. elliptical orbits – 2. closer to the sun the fast planet revolves – 3. Farther from the sun takes longer to orbit Galileo – Italian scientist • Heliocentric • Found 4 moons of Jupiter • Found that Venus goes through phases