FAMOUS ASTRONOMERS

ARISTOTLE

• Born 384 BCE
• Died 322 BCE
• Thought the Earth was the center of all things

ARISTOTLE'S MODEL

ARISTARCHUS

• Born 310 BCE
• Died 230 BCE
• Measured the distance from the moon and the sun
• Heliocentric model

ARISTARCHUS'S MODEL

PTOLEMY

• Born AD 90
• Died AD 168
• A celestial body traveled at a constant speed in a perfect circle

PTOLEMY'S MODEL

NICOLAUS COPERNICUS

• Born 1473
• Died 1543
• Like Ptolemy he thought planetary paths should be perfect circles

COPERNICUS'S MODEL

JOHANNES KEPLER

• Born 1571
• Died 1630
• Kepler's laws

KEPLER'S LAWS

• 1) planetary orbits are ellipeses with the sun at one focus
• Plants move faster in orbit then closer to the sun
• The distance from a planet to the sun and time it takes to orbit

GALILEO GALILEI

• Born 1564
• Died 1642
• Scientific methods, invented telescope

GALILEO'S TELESCOPE

ISAAC NEWTON

• Born 1642
• Died 1727
• Three laws of motion

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EDWIN HUBBLE

• Born 1889
• Died 1953
• Extragalactic Astronomy

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