Sun, Moon, Earth,

How do they work together to help life survive?

Our Solar System

Solar System:• The question for the ages:

Solar System:• The question for the ages:

What is moving around what?

Solar System:• Early Theories:

Solar System:• Early Theories:

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

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.

Ptolemy model:

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.

Solar System:• Early Theories:

– Greeks: Heliocentric System: Earth and the other planets revolve around the sun.

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.

Copernican Revolution:

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.

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.

Solar System:• Early Theories:

–Tycho Brahe (late 1500s: Planetary orbits.

Solar System:• Early Theories:

–Tycho Brahe (late 1500s: Planetary orbits.

–Johannes Kepler (early 1600s): Orbit of each planet is an ellipse.

Kepler’s Model: