1. Sun, Moon, Earth, How do they work together to help life survive? Our Solar System

2. Solar System: The question for the ages:

3. Solar System: The question for the ages: What is moving around what?

5. Solar System: Early Theories:

6. Solar System: Early Theories: –Greeks: Geocentric System (Earth is at the center and the sun and planets revolve around the Earth.

7. Solar System: Early Theories: –Greeks: Geocentric System (Earth is at the center and the sun and planets revolve around the Earth. –About 140 A.D. Ptolemy: Geocentric model with planets moving on smaller circles.

8. Ptolemy model:

9. Solar System: Early Theories: –Greeks: Geocentric System (Earth is at the center and the sun and planets revolve around the Earth. –About 140 A.D. Ptolemy: Geocentric model with planets moving on smaller circles. Widely accepted for about 1500 years.

10. Solar System: Early Theories: –Greeks: Heliocentric System: Earth and the other planets revolve around the sun.

11. Solar System: Early Theories: –Greeks: Heliocentric System: Earth and the other planets revolve around the sun. –Copernican Revolution 1543: Nicolaus Copernicus worked out how the planets moved around the sun and in what order.

12. Copernican Revolution:

13. Solar System: Early Theories: –Greeks: Heliocentric System: Earth and the other planets revolve around the sun. –Copernican Revolution 1543: Nicolaus Copernicus worked out how the planets moved around the sun and in what order. –1610 Galileo: Used a telescope to discover four moons revolving around Jupiter.

14. Solar System: Early Theories: –Greeks: Heliocentric System: Earth and the other planets revolve around the sun. –Copernican Revolution 1543: Nicolaus Copernicus worked out how the planets moved around the sun and in what order. –1610 Galileo: Used a telescope to discover four moons revolving around Jupiter. Proved Geocentric model was incorrect.

15. Solar System: Early Theories: –Tycho Brahe (late 1500s: Planetary orbits.

16. Solar System: Early Theories: –Tycho Brahe (late 1500s: Planetary orbits. –Johannes Kepler (early 1600s): Orbit of each planet is an ellipse.

17. Kepler’s Model: