1. The Universe

2. Expansion 1929 Edwin Hubble Universe is expanding Approaching
Red Shift (Doppler Effect)
Approaching
Blue Shift
Expansion

3. Implications of Expansion
Once the universe was smaller
Big Bang Theory
Explosion Billion years ago
~13.7 billion years old
Time, matter and energy
Implications of Expansion

4. Evidence Cosmic Background Radiation Arno Penzias and Robert Wilson
1965
Temperature of the Universe is 2.7K
Evidence

5. What’s Next The universe may keep expanding forever
The universe may slow down as it reaches a limit
The universe may stop expanding and start collapsing
New technologies
New models
What’s Next