2. Earth in the Universe Celestial Objects – any objects outside our atmosphere. We look up. At night. In a cloudless night. There are 6000 of them that can be seen in an unaided eye.

3. Are We alone?

4. Universe – everything that exists in any place. It’s vast. Maybe eternal. And expanding. It has formed some 10-13.7 billion years ago.

5. HOW?

7. Big Bang Theory States that all matter and energy started out concentrated in a small area the explodes!

8. Are we sure?

9. Compelling Evidence! 1. An expanding universe

10. 2. Doopler Effect Think of a train approaching and going!!!!!!!!!!!!!!

12. When it shifts to blue, its coming towards us!

13. When it shifts to Red, its going away!