1. Organization of the Universe
Darnell wants to see if flies like honey or vinegar more. He puts out two bowls: one of honey, one of vinegar. Then, he counts how many flies land on each bowl.
What is the independent variable?
What is the dependent variable?
What is one constant?
Write in complete sentences!
Don’t talk during the Catalyst!

2. Objectives
By the end of today, all SWBAT…
Describe the organization of the solar system
Illustrate how planets move around the Sun
Define how orbit size impacts year length

3. Organization of the universe
Agenda
Catalyst review
Homework review
Organization of the universe
Heliocentric model
Revolution
Exit Question

4. From smallest to largest
Key Point #1: The universe has many levels of organization
Planet: mass that orbits a star
Solar system: Many planets that orbit the same star
Galaxy: Many solar systems together
Milky Way
Universe: all matter that exists in space

5. Planets

6. Solar system 8 planets in our solar system Mercury Venus Earth Mars
Jupiter
Saturn
Uranus
Neptune

7. Galaxy

8. Universe

9. Planet, Solar system, Galaxy or Universe
Who Am I????
Planet, Solar system, Galaxy or Universe

10. Universe, Galaxy, Solar system or Planet??
9 planets that rotate around the Sun

11. Universe, Galaxy, Solar system or Planet??
All matter that exists in space

12. Universe, Galaxy, Solar system or Planet??

13. Universe, Galaxy, Solar system or Planet?
Milky Way

14. Universe, Galaxy, Solar system or Planet??

15. Universe, Galaxy, Solar system or Planet??

16. Universe, Galaxy, Solar system or Planet??
More than one planet orbiting a star

17. Universe, Galaxy, Solar system or Planet??
Largest level of organization in space

18. Universe, Galaxy, Solar system or Planet??
Large than a planet, but smaller than a galaxy

19. Heliocentric? What that is?
Key Point #2: In our solar system, all planets rotate around the Sun in an ellipse
Called the heliocentric model
Helio =
Centric=

20. Complete the classwork worksheet

21. 1A. From the reading on the following page, answer these questions:
1.What is a theory?
2.What was the theory proposed before the heliocentric model? What did this theory state?
3.What evidence supported the geocentric model?
4.Who disproved the geocentric model? What was the evidence?

22. 1B. Illustrate the geocentric theory
1C. Illustrate the heliocentric theory
1D. In words, compare and contrast the heliocentric and geocentric models

23. Key point #3: One year is determined by one complete orbit (or revolution) around the Sun
Farther away from Sun = longer year
Closer away from Sun = shorter year

25. Which planet in the solar system has the longest year length?
Which planet in the solar system has the shortest year length?
Mars has a longer year than Earth. Explain why this is so.
 What would happen to Earth’s year length if it gradually starting moving away from the Sun?
It takes Neptune 165 Earth years to revolve around the Sun

26. Homework
Homework

27. Exit Questions
Order these vocabulary words from largest to smallest: solar system, universe, galaxy, planet
What is the difference between the geocentric and the heliocentric model? Which one is correct?
What would happen to the length of Earth’s year if Earth’s orbit got LARGER? Explain why.
Write in complete sentences!
Don’t talk during the Exit Question!