3. Original Understanding: Planets + stars were being pulled towards the sun by the force of gravity.
4. Edwin Hubble: Discovered the expansion of the universe.
5. Hubble's Law: The speed of a galaxy moving away from our galaxy is directly proportional.
6. Summary
7. Initial explosion.
8. Time & Space began in the Big Bang
9. Scientists discovered "Background Radiation " = Residue of the Big Bang.
10. Both cosmologies support one another.
11. The Big Bang Theory
12. Universe began 18 billion years ago in a giant explosion.
13. Universe: Is Expanding and Cooling
14. Edwin Hubble: Discovered that other galaxies are moving away from our galaxy.
15. Arno Panzias + Robert Wilson: During the 1960s, discovered Big Bang afterglow, known as cosmic microwave background, revealing the universe was once a hot and very hostile place.
16. Cosmology = The study of the origin & nature of the universe.
17. Conclusion
18. Universe began as an infinitely compact fireball.
19. During the Big Bang, time and space were created and then space was stretched.
20. Present day universe is still expanding and also cooling.
