Download SPACE SCIENCE UNIT 2 LESSON 1

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