|Aristotle||ancient Greek scientist, lived over 2300 years ago. Taught that the Earth was center of Solar System. Believed by kings and Catholic Church.|
|Ptolemy||Ancient Greek scientist who wrote about the Geocentric model of the solar system, lived 2,000 years ago.|
|belief that ALL objects in the solar system revolve around Earth, the Earth is the center of the universe. The Earth does not move.|
the sun is the center of the solar system and the Earth is moving around the Sun.
|Copernicus||Polish astronomer who thought of the heliocentric view of the solar system, wrote book, afraid to publish until dying.|
|Galileo||Italian scientist who used a telescope to prove that the heliocentric model was correct, he also gave us the scientific method.|
|Sir Isaac Newton||English scientist who defined gravity and explained how it made the heliocentric model work.|
|gravity||the force that all objects exert on each other because of their mass. Gravity holds the solar system together.|