Astronomers

ARISTOTLE

• Lived 384-322 B.C.E
• He was a philosopher
• Explained how the universe was formed
• He was also an astronomer
• People began to understand the universe

ARISTARCHUS

• Lived in 310-230 B.C.E.
• He was a mathematician
• Created the first known model -
• that placed the sun at the center of the universe
• With the earth revolving around it

PTOLEMY

• Lived in 367-283 B.C.E.
• Helped to map the universe
• He was s mathematician and astronomer
• Mapping the universe helped people to
• See what the universe looks like

NICOLAUS COPERNICUS

• Born in 1473
• Proposed that the sun was stationary
• In the center of the universe and the earth
• Revolved around it.
• Died inu 1543

JOHANNES KEPLER

• 1571-1630 lived and died
• Was famous for the planetary motion
• Laws that he created.
• He was a mathematician
• He was also an astronomer and astrologer

GALILEO GALILEI

• 1546-1642
• Was an italian physicist and astronomer
• Played a major role in the scientific
• Revolution.
• Played a key role in science history

ISAAC NEWTON

• 1643-1727
• One of the most influential
• Scientists
• Key figure in scientific revolution
• Discovered gravity

EDWIN HUBBLE

• 1889-1953
• Played a key role in the field
• Of extraglactic astronomy
• From marshfield MO
• One if the most important cosmologists

GEOCENTRIC SOLAR SYSTEM

• Also known as ptolemaic system
• Theory developed by greek philosphers
• To explain how the sun and stars orbit around earth

HELIOCENTRIC MODEL

• It is the astronomical model in which
• The earth and planets revolve around
• A relatively stationary sun at the center
• Of the solar system.
• Galileo defended this type of model