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SPACE SCIENCE UNIT 2 LESSON 1

SPACE SCIENCE UNIT 2 LESSON 1. Historical Modes of the Solar System. Solar system – the sun and all of the bodies that orbit it. Models of the solar system. Heliocentric – the sun is the center of our solar system 2. Geocentric – the earth is the center of our solar system

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SPACE SCIENCE UNIT 2 LESSON 1

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  1. SPACE SCIENCE UNIT 2 LESSON 1 Historical Modes of the Solar System

  2. Solar system – the sun and all of the bodies that orbit it

  3. Models of the solar system • Heliocentric – the sun is the center of our solar system 2. Geocentric – the earth is the center of our solar system 3. Parallax – The apparent shift in the position of an object when viewed from different locations

  4. Aristotle – Greek philosopher384-322 BCE • Geocentric model • Parallax

  5. Aristarchus – Greek Astronomer and Mathematician310-230 BCE Heliocentric Not widely accepted Attempted to measure relative distances to the moon and sun

  6. Ptolemy – Egyptian Astronomer and Mathematician 100-170 CE • Geocentric • His book was based observations going back 800 years • First detailed model of geocentric model (used for the 14 centuries) • Celestial bodies travel at a constant speed • Orbits perfect circle • “Wheels on Wheels” system

  7. Copernicus – Polish Astronomer1473-1543 • Heliocentric • Made first detailed model of heliocentric model • First step in the modern model • Orbits perfect circles • “Wheels on Wheels” system

  8. Brahe – Danish Astronomer1546-1601 • 20 years of observations of the planets

  9. Kepler – German Astronomer1571-1630 • Heliocentric • Used Brahe’s observations • 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

  10. Galileo – Italian scientist1564-1642 • Heliocentric • Used scientific method • Evidence for heliocentric model • Found 4 natural satellites of Jupiter • Found that Venus goes through phases • Not all bodies in space revolve around earth

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