FAMOUS ASTRONOMERS

Aristotle

• He lived from 384 B.C to 322 B.C. He was a greek philosopher
• Aristotle used many methods to prove the earth is a sphere
• Came up with the geocentric view of the solar system

ARISTARCHUS

• Born 310 BCE and died 230 BCE
• He proved that the earth's diameter is twice the diameter of the moon
• Tried to measure distance to moon and sun

PTOLEMY

• Lived 90 AD to 168 AD
• He developed the theory that the earth centered universe
• Tried to explain the retrograde motion of planets
• He observed that planets moved backwards in the sky

GEOCENTRIC MODEL OF THE SOLAR SYSTEM

• Earth is the center of all planets in this theory

NICOLAUS COPERNICUS

• Lived from 1473-1543
• Deceloped the first detailed heliocentric model of the solar system
• He said that they moved in perfect circles around the sun

HELIOCENTRIC MODEL OF THE SOLAR SYSTEM

• The sun is the center of all of the planets in this theory

JOHANENES KEPLER

• Lived from 1571-1630
• He proposed the Kepler Laws

GALILEO GALILEI

• Lived from 1564-1642
• He made signifigant improvements to the newly invented telescope
• With his new telescope he observed the moons orbiting jupiter.

ISAAC NEWTON

• Lived from 1643-1727
• He discovered the law of gravity to make the helio and geo metric models possible

EDWIN HUBBLE

• Lived from 1864-1934
• He was able to present evidence for the expansion of the universe

THE END :)