ASTRONOMERS

ARISTOTLE

• Lived from 384 bc-322 bc
• He was one of the first to figure out that the earth was round
• He was one of the people that first systimizzedd philosaphy

ARISTARCHUS

• He lived from 310 bc-230 bc
• He figured out how to measure the size of the sun and the moon
• Determined the method of relative distance

PTOLEMLY

• Lived from 90 ad-168 ad
• He discovered the rotation of the planets
• He influenced greek astronomers for many years

COPERNICUS

• Lived from 1473-1543
• He formed the heliocentric model
• No one belived in his ideas

KEPLER

• Lived from 1571-1630
• He discovered the laws of planetary motion
• He was also known the Kepler conjecture

GALILEO

• He lived from 1564-1642
• He made huge contributions by him observing space
• He discovered the four largest satellites of Jupiter

ISAAC NEWTON

• Lived from 1643-1727
• He made the law of gravity
• Made the laws of motion

EDWIN HUBBLE

• HE lived from 1889-1953
• He implied that the universe was expanding
• He made the Hubble space telescope

GEOCENTRIC MODEL

HELIOCENTRIC MODEL