Galaxies and Our Universe: Past, Present, and Future

• Presentation by Prof. Hall
  
• Types of Galaxies
• Groups of Galaxies: Sloan Digital Sky Survey mosaic of the Virgo Cluster of galaxies
• The Motion of Galaxies & the Expansion of the Universe
  • Discovering Hubble's Law (Chapter 15 LL applet)
  • Hubble Expansion of the Universe (Chapter 15 UL applet)
    
    
    
    
    
    
    
    
    
    
    
  • Balloons!
    • Share a balloon with two other classmates
    • Look at two points on the balloon
    • Have a friend SLOWLY blow up the balloon
    • See how those two points move apart?
    • Take turns looking at the balloon while it's blown up
    • It doesn't matter which two points you look at, they ALL move away from each other!
• Formation of Galaxies
  • Galaxy Collision Animation (Chapter 15 CR anim) & photo (Chapter 15 LL)
• What kind of stuff makes up the Universe?
  • Large-Scale Structure of the Universe (Chapter 16 UC applet)
• What will happen to the Universe in the future?
  • Orbital Trajectories of Cannonballs (Chapter 16 UC applet)
  • Dependence of Escape Velocity on a Planet's Mass (Chapter 16 LC applet)
  • Evolution of the Universe: Dependence on Dark Energy (Chapter 16 LL applet)