1. Dark Matter The Portion of the Universe You Have to Appreciate to “See” By Andre Bosman and Barbara Anderson

2. The Portion of the Universe You Have to Appreciate to “See” What is Dark Matter? (Andre) Why we think Dark Matter exists? (Andre) How we can “see” Dark Matter? (Andre) What is Dark Matter made up of? (Barbara) Why is Dark Matter important? (Barbara) Questions and Answers (Class/Barbara/Andre) 6/15/20132

3. What is Dark Matter? Invisible to us Cannot be seen directly with telescopes Does not emit or absorb light Has no significant electromagnetic radiation 6/15/20133

4. What is Dark Matter? Has mass Has gravitational pull Framework that holds galaxies together Like a Christmas tree – Lights are the galaxies – Tree is Dark Matter 6/15/20134

5. Why we think Dark Matter exists? Some galaxies not behaving according to Newton and Einstein laws Greater mass of an object the greater the gravity Further an object is from center the slower the object Galaxies are moving too fast for the amount of visible mass (matter) that can be seen 6/15/20135

6. Why we think Dark Matter exists? Not enough visible mass (matter) in galaxies to account for observations Must be Dark Matter 6/15/20136

7. Orbiting ball visible to us Why we think Dark Matter exists? Not enough visible mass in galaxies 6/15/20137 Mass (gravity) not visible to us

8. Orbiting ball visible to us Why we think Dark Matter exists? 6/15/20138 ? Mass (gravity) not visible to us Not enough visible mass in galaxies

9. How we can “see” Dark Matter? Gravitational lensing 6/15/20139 Light is affected by the curvature of space-time (or affected by gravity in other words)

10. How we can “see” Dark Matter? We can view distant galaxies through the “lens” created by gravitational bending of light. 6/15/201310

11. How we can “see” Dark Matter? Astronomers have mapped some of the Dark Matter in our universe 6/15/201311

12. What is Dark Matter made up of? WIMPS is a candidate for Data Matter Weakly Interacting Massive Particles 6/15/201312

13. What are the types of Dark Matter? WIMPS are: – Elementary particles – Have very small interaction with ordinary matter This why it is so hard to see them – Are very spread out (not clumped) 6/15/201313

14. Why is Dark Matter important? Holds the true secrets of the universe Has power to influence galaxies – How they form – How fast they spin Might hold the secret to how the universe was formed and how it will end 6/15/201314

15. SUMMARY Three minute video time permitting: By Lon Lincoln TED Education http://www.youtube.com/watch?v=sI23cwbbNqs 6/15/201315

16. 6/15/201316 Questions and Answers