1. The Solar System December 13, 2010

2. Objectives TODAY I WILL BE ABLE TO: – Differentiate between the _________and _________________of the earth. – Explain how the ___________in the earth’s axis creates ____________________. – Defend whether or not you agree with the ______ ___________________________

3. Key Points The Big Bang Theory states that the Universe was created in a ___________moment in time. The Big Bang is a ________, and there are other theories that attempt to explain the origin of the Universe. The earth’s ____________is the turning or spinning of a body on its axis. The earth’s rotation is the movement responsible for day and night. The earth’s tilted _________causes seasons. Earth’s movement, or orbit around the sun is known as REVOLUTION.

4. ORIGIN OF MODERN ASTRONOMY

6. Astronomy is the science that studies the ______________________. ___________________ – Concluded that the earth was ___________ because it had a curved shadow. ______centric view – the ____________ was the center of the universe Geocentric Model – the Earth was a sphere that stayed motionless at the center of the solar system. The sun, moon, and known planets revolved around the Earth. Supported by Aristotle, believed for 2000 years!

8. _______centric Model – the ___________was at the center of the universe. The Earth and other planets orbit the sun. Supported by Aristarchus. Copernicus concluded that Earth is a ________. The sun is at the center of the solar system and the planets orbit the sun. In the Copernican model, the orbits of planets were perfect circles.

9. Motions of the Earth _______________– turning on axis, results in ______ ______________ and defines the length of a day – Noon to noon is 24 hours (solar day) _______________– __________________________, defines the year, changes what constellations we can see in the night sky _______________- Earth’s _______slowly but continuously points in different _____________.

10. Earth’s _____________causes ________________ – June 21-22 Summer solstice – March 20 or 21 or September 22-23 are the equinoxes (equal length of day and night) – December 21-22 Winter solstice The solar system is rotating in the arms of the Milky Way _________________at 250 km/second The entire galaxy is also moving. The Milky Way galaxy is moving toward Andromeda

11. Check Ins – Use complete sentences 1.Explain the Geocentric model of the Universe. Explain the Heliocentric model of the Universe. Which model do we know to be true? 2.“Earth’s axis slowly but continuously points in different directions” – this describes which movement of the earth? 3.Describe earth’s rotation and what it affects. 4.What movement of the earth creates seasons?

12. Origins of the Universe Throughout history there have been many theories about how the universe formed. Today we are going to read about “The Big Bang” theory. As you read, answer the questions on your worksheet. This is due in 20 minutes.