ASTRONOMY

ARISTOTLE

• Believed the Earth was the center of the solar system
• Believed that if the Earth rotated around the sun, the stars would change position
• Was one of the first to propose the geocentric model

ARISTARCHUS

• Believed the Sun was the center of the solar system
• Proposed the heliocentric model
• Attempted to measure the relative distance between the sun and the moon

PTOLEMY

• Believed the sun rotated the Earth
• Developed a detailed geocentric model
• Developed the wheels on wheels system

COPERNICUS

• Believed the Earth rotated the sun
• Developed the first detailed heliocentric model
• Used the wheels on wheels system

KEPLER

• Believed the Earth rotated the sun
• Realized the planets do not move in perfect circles
• Developed Kepler's Laws

GALILEO

• Believed the Earth rotated the sun
• Improved the telescope
• Observations supported the heliocentric model

NEWTON

• Believed the Earth rotated the sun
• Developed the law of universal gravitation
• Mathematically described how gravity acted

HUBBLE

• Believed the Earth goes around the sun
• Proved the existence of other galaxies
• Proved that the universe is expanding