1. The
Geocentric
and
Heliocentric
Theories

2. Where it all Began
Scientists believe that the universe started from a PRIMEVAL ATOM
The Primeval atom was a very hot and very dense mass of energy

3. Evidence for the Big Bang
The galaxies are really far apart
The distance between galaxies is still expanding
So this bang is probably still happening and creating new galaxies and other things in our universe

4. The Geocentric Theory Geo = Earth Centric=Centered
Geocentric = “Earth Centered”
It means that the Earth is in the center of the universe

5. The Geocentric Model of the Solar System

6. Heliocentric Helio=Sun Heliocentric = “sun centered”
It means that the sun is in the center of the Universe
Helio = sun

7. The Heliocentric Model of
the Solar System

9. PRACTICE Scientists believe that the universe is
Shrinking
Constant
Expanding
None of the above
The theory that the universe began with a tremendous explosion is called ____________________.
The universe is believed to have started with the ____________.
What was the Primeval atom made up of?
Given the conditions of the primeval atom, is it possible for anything to live in the atom? Explain your answer
How are the geocentric and heliocentric views different?

10. FAMOUS PEOPLE YOU SHOULD KNOW

11. Ptolemy
Believed that the earth was at the center of the universe

12. Copernicus
Believed the sun was at the center of the universe

13. Kepler
Believed that the planets did revolve around the earth in an elliptical pattern.
The sun was not at the exact center

14. Galileo
First person to use a telescope to look at the stars, planets, universe and so on.
This gave him proof that the sun was in the center of our solar system

15. Newton
Believed sun was in the center of the universe but gravity is what holds everything together in place

16. Practice
Classify the following famous as either Heliocentric believers or geocentric believers
Copernicus
Ptolemy
Galileo
Newton
Kepler