ASTRONOMERS

ARISTOTLE

• Lived 384-322 BCE
• Said Earth was center of all things
• Said positions of stars moved as earth did
• Showed parallax

ARISTARCHUS

• Lived 310-230 BCE
• Tried to measure the distances betweeen moon & sun
• Proposed a heliocentric model of solar system

PTOLEMY

• Lived 100-170 CE
• Wrote a book, the Algamest
• Developed a detailed genocentric model
• Said everything evolved around earth
• His model showed better proof that any others before

NICOLAUS COPERNICUS

• Lived 1473-1543
• Made a detailed heliocentric model
• Agreed to the idea of circle movemts of planets
• Used "wheels-on-wheels" system

JOHANENES KEPLER

• Lived 1571-1630
• Found that elipses fit best for the path of planets
• Formulated three principles (Keplers laws)

GALILEO GALILEI

• Lived 1564-1642
• Improvements to the telescope
• Observed the moons
• Found that earth isnt the only object being orbited
• Venus went through similar earth phases

ISAAC NEWTON

• Lived 1642-1727
• Wrote a book
• Built first reflecting telesope
• Formulated laws of motion

EDWIN HUBBBLE

• Lived 1889-1953
• Began "Hubble's law"
• Theory of metric espantion of space
• Believed that no light could travel through space