1. The Universe

2. A Celestial Object is any object in our universe above our atmosphere. A Celestial Object is any object in our universe above our atmosphere. Examples: Moon, Stars, Planets Examples: Moon, Stars, Planets The Universe is everything and anything. It is estimated to be 10-20 billion years old. The Universe is everything and anything. It is estimated to be 10-20 billion years old. The current estimate is 13.7 billion years old. The current estimate is 13.7 billion years old. You must know….

3. Big Bang Theory The big bang theory states that the universe began with an explosion of matter approx. 13.7 BYA. Over millions and billions of years, atoms became organized in celestial bodies and stars held together by gravity. Mostly hydrogen and helium.

4. Galaxies A Galaxy is a group of stars, dust, and gas held together by gravity. A Galaxy is a group of stars, dust, and gas held together by gravity. Our Solar System is part of the Milky Way Galaxy. Our Solar System is part of the Milky Way Galaxy. The Milky Way Galaxy is spiral shaped. The Milky Way Galaxy is spiral shaped. Just about every star and galaxy is moving away from each other: Just about every star and galaxy is moving away from each other: This is proved by Red Shifting. Therefore the universe is expanding! This is proved by Red Shifting. Therefore the universe is expanding!

5. OLDEST Universe Milky Way Galaxy Solar System YOUNGEST

6. In your notes draw the corresponding symbols based on their size. S

10. Free Write: What you know about the Geocentric and Heliocentric models of the solar system? Take out a piece of loose leaf and fold it in half. Write your response on one half. Take out a piece of loose leaf and fold it in half. Write your response on one half. You may use the diagram, your notes, to help you write your details. You may use the diagram, your notes, to help you write your details. Keep writing until time is announced to stop Keep writing until time is announced to stop

11. Models to Explain Motion Geocentric Model – Earth centered. Geocentric Model – Earth centered. Planets, stars, and other objects revolve around Earth. Planets, stars, and other objects revolve around Earth. This model was able to explain the apparent motion of the stars, sun, and moon. This model was able to explain the apparent motion of the stars, sun, and moon. Could not explain retrograde motion and Foucault pendulum motion. Could not explain retrograde motion and Foucault pendulum motion.Foucault pendulumFoucault pendulum

12. Retrograde Motion Retrograde motion is an apparent motion of planets (over weeks to months) when they appear to change position with respect to the background field of stars. Retrograde motion is an apparent motion of planets (over weeks to months) when they appear to change position with respect to the background field of stars.

13. Retrograde Motion Cont… Retrograde motion is caused by Earth and other planets revolution around the Sun in different orbits at different speeds. Retrograde motion is caused by Earth and other planets revolution around the Sun in different orbits at different speeds.

14. Retrograde Motion of the Planets http://www.flex.com/~jai/astrology/retrograde.html

16. Models to Explain Motion Heliocentric Model – Sun centered. Heliocentric Model – Sun centered. Earth rotates on an imaginary axis and revolves around the Sun. Earth rotates on an imaginary axis and revolves around the Sun. The Moon revolves around Earth. The Moon revolves around Earth. Explained all of the observations made by the scientists including retrograde motion. Explained all of the observations made by the scientists including retrograde motion.

18. Summarize: Why did the acceptable models change from geocentric to heliocentric? Write your response on the unused half of paper. Write your response on the unused half of paper. You may use the diagram and your notes to help you write your details. You may use the diagram and your notes to help you write your details. This is an individual task This is an individual task Keep writing until time is announced to stop Keep writing until time is announced to stop