1. the evolution of our space model
Early Astronomers
the evolution of our space model

2. Geocentric model (1) Earth centered universe
Earth is the center of the solar system
Stars rotate around the Earth.

3. Earth centered model
Earth

5. Aristotle (2) Grandfather of science Used observation based science.
Did experiments to study scientifically.
So respected his wrong ideas were taught.

6. Star trails

7. Ptolemy (3) Astronomer and mathematician Published ideas in books.
He “made” the math work for the geocentric model.

8. Heliocentric model (4) Sun centered universe.
Planets are in orbits around the Sun.
Stars are distant and do not move.

9. Copernicus (5) Brought heliocentrism to the Renaissance
Used scientific observation.
Discovered Earth rotates on its own axis
His followers were called Copernicans

10. Sun centered model
Copernicus’s diagram
Sun

11. Sun

12. Sun

13. Galileo (6) Built a telescope to prove Copernican model correct.
Forced to admit wrong-doing by the Church
Although locked away for life, his ideas were shared in books

14. Sun

15. Sun

16. Modern Universe Model
- today’s model