1. QUICK QUIZ 1)What is the Big Bang Theory? 2)What evidence do we have to prove this? 3)According to the Big Bang Theory, how old is the universe?

2. ALTERNATIVES TO THE BIG BANG

3. STEADY STATE UNIVERSE To explain the expansion of the universe, steady state theorists think that there is a continuous creation of matter. This type of universe would be infinite, with no beginning or end. However, a mountain of evidence found since the mid- 1960s indicates that this theory is not correct.

4. ETERNAL INFLATION THEORY/MULTIVERSE THEORY After the Big Bang, the universe expanded rapidly during a brief period called inflation. The Eternal Inflation theory posits that inflation never stopped, and has been going on for an infinite length of time. Somewhere, even now, new universes are coming into existence in a vast complex called the multiverse. Those many universes could have different physical laws. Those many universes could have different physical laws https://www.youtube.com/watch?v=9QxESRBpVZg https://www.youtube.com/watch?v=Ywn2Lz5zmYg

5. OSCILLATING MODEL The Oscillating model of the universe involved an endless series of Big Bangs, followed by Big Crunches that restarted the cycle, endlessly. https://www.youtube.com/watch?v=q3MWRvLn dzs https://www.youtube.com/watch?v=q3MWRvLn dzs

6. FLAT HOLOGRAM MODEL Implications found in quantum gravity and string theory suggest a universe that is in reality nothing like how it appears to human observers. It may actually be a flat hologram projected onto the surface of a sphere. https://www.youtube.com/watch?v=RWnduAnxLQ4 https://www.youtube.com/watch?v=A5xMveKmUOg