(8th) Chapter 14-1 Cornell Notes Observing the Solar System

Chapter 14-1 Cornell Notes Key Questions 1. What is the difference between the “geocentric” and “heliocentric” models of the solar system? 2. Draw an ellipse.

Chapter 14-1 Cornell Notes Key Terms geocentric- heliocentric- ellipse- moon- astronomical unit (AU)-

Chapter 14-1 Cornell Notes Heading 1 Earth at the Center “geo” Greek word for Earth’ geocentric: Earth at the center of the solar system; 140 AD Ptolemy added to the theory.

Chapter 14-1 Cornell Notes Heading 2 Sun at the Center another Greek scientist developed heliocentric model; heliocentric: Sun at the center of the solar system; 1500s Copernicus added the order of planets and their orbit around the sun; Galileo invented the telescope; supported the heliocentric model.

Chapter 14-1 Cornell Notes Heading 3 Motions of the Planets Copernicus wrongly thought planet’s orbits were circular; 1500s Brahe made better observations on the orbits; Kepler developed 3 laws on planet motion: 1. Orbit is an ellipse shape; 2. Moves faster when close to the sun; 3. Orbit time is related to length from the sun.

Chapter 14-1 Cornell Notes Heading 4 Modern View of the Solar System new facts about the solar system; planets different in size and looks; all planets but Mercury and Venus have moons; moons are natural satellites of the planets; Today it contains the sun, planets and moons plus other smaller objects.