1. On your notes write out your address…
Activating Strategy:
On your notes write out your address…
After today’s lesson, you should be able to answer all of these questions and more!
Now what country…
What continent…
What planet…
What galaxy?

2. How is our solar system positioned in the milky way galaxy and the universe?
S6E1b. Describe the position of the solar system in the Milky Way Galaxy and the universe.

3. Let’s review
Turn to a seat partner and discuss the theory on how the universe was formed.

4. The Big Bang Theory
The most commonly accepted theory today of the formation of the universe is the Big Bang Theory.
The theory states that the universe originated sometime between 10 billion and 20 billion years ago from an enormous explosion of a small volume of matter at extremely high density and temperature.

5. Let’s review the formation of other objects within the solar system.

6. the Universe After its Big Bang…
As millions of years passed, the dense areas of the universe pulled in material because they had more gravity. Finally, about 100 million years after the Big Bang, the gas became hot and dense enough for the first stars to form. Large clusters of stars soon became the first galaxies.
Scientists believe that Solar Systems formed in similar ways. Giant clouds of dust and gas began to collapse under the weight of its own gravity. As it did so, the matter contained within it began to move in a giant circle, much like the water in a drain moves around the center of the drain in a circle.
In short, after the Big Bang, dense clouds of gas and dust from the “bang” either collapsed or stuck together to form the parts of the universe we know today.
Further away from the center of this mass where the star was forming, there were smaller clumps of dust and gas that were also collapsing.
The star in the center eventually ignited forming our Sun, while the smaller clumps became the planets, minor planets, moons, comets, and asteroids.
At the center of this spinning cloud, a small star began to form. This star grew larger and larger as it collected more and more of the dust and gas that collapsed into it.

7. The Universe contains billions of galaxies, each containing millions or billions of stars. Therefore, the galaxy in which our solar system and essentially all of us live, is just one of billions.

8. Distributed Summarizing: Turn to a seat partner and come up with a comparison of our galaxy within the universe.

9. Our galaxy is called the Milky Way Galaxy.

10. The Milky Way Galaxy
Contains single star systems, double stars, and dust and gas
It is a spiral galaxy because it has spiral arms that wind outward from the center

11. The Milky Way Galaxy Why is our galaxy called the Milky Way?
Thousands of years ago people thought the stars appeared as a patchy band of light like a flowing river of milk, thus the name Milky Way.
Also, the word galaxy comes from the Greek word gala, meaning milk.

12. Our solar system
Our solar system is a single star system located on an outer rim (arm) of the Milky Way Galaxy.

13. Our solar system
Here is another view of the location of our solar system in the Milky Way Galaxy.

14. Study Jams: The Solar System

15. Examine the Milky Way galaxy at different scales
Scale of the universe animation
Digital Universe
Examine the Milky Way galaxy at different scales

16. Distributed Summarizing:
The map to the right shows Troup County. The lines and numbers represent interstates and major roads running through Troup County.
Imagine that the circle in the middle of the map is the center of the Milky Way Galaxy. Draw an asterisk (*) showing where the Solar System might be located on our Troup County map.

17. Summarizing STrategy
Universe Match-up