1. Lesson 50 Our Place in the Universe
Subtitle

2. Activator
What words do you think of when you think about the Universe? Make a word web to display your thoughts

3. What is the Universe made up of?
All Matter!
Only 4% of the Universe is made up of things we can see
96% of stuff we can see → Dark Matter
Galaxies
Systems of millions/billions of stars with gas and dust
Held by gravitational attraction
Astronomers estimate 100 billion galaxies in the observable universe

4. Our Galaxy Three main types of galaxies
Elliptical: Smooth bright and featureless
Spiral: Swirly
Irregular: No distinct shape
Which one is our galaxy?

5. Milky Way Galaxy Contains our Solar System
Over 200 billion stars and enough dust and gas to make billions more
Located 30,000 light-years away from the galactic center
Our galaxy spins at 163 miles per sec

6. The Milky Way is Spinning, What else is?
What else in space is spinning?

7. Earth Spinning? What does the spinning of Earth cause?
There are a couple things?

8. Classwork
WHY DO WE HAVE SEASONS worksheet After you have completed the worksheet grab a laptop Research what would happen the Earth stood still. Use your graphic organizer to help you write a response