2. The Doppler Effect  http://www.youtube.com/watch?v=Y5Ka eCZ_AaY http://www.youtube.com/watch?v=Y5Ka eCZ_AaY

4. Doppler Effect Explained  http://www.youtube.com/watch?v=- t63xYSgmKE&feature=related http://www.youtube.com/watch?v=- t63xYSgmKE&feature=related  http://www.youtube.com/watch?v=Djz_rt nXSfY http://www.youtube.com/watch?v=Djz_rt nXSfY

7. Hubble’s Discovery  In the early 1920’s, Edwin Hubble observed 46 Galaxies  He notice most of these galaxies were “red-shifted”, meaning were moving away from earth.  What conclusion do you think he made from this discovery? (TPS)

8.  http://www.youtube.com/watch?v=Fhfnq boacV0&feature=related http://www.youtube.com/watch?v=Fhfnq boacV0&feature=related

9. Evidence for the Big Bang  The Red-shifted galaxies observed by Hubble give evidence of the Big Bang  Hubble observed that the farther a galaxy was away from earth, the faster it is moving away  This led to the conclusion that the universe is expanding

10. Big Bang  The Big Bang theory states that the universe formed when an infinitely dense point suddenly and rapidly expanded in a single moment.  All the matter and energy that exists today was created during the early minutes of that hot, rapid expansion.