In this exercise you will have the opportunity to view some videos. These videos will give insight on the topic of galaxies, the first few minutes after the Big Bang and how technology has enabled astronomers to look further and probe deeper. EQUIPMENT A computer. You will be watching the videos on the websites listed below. EXERCISE A. Go to and watch the video called Monster of the Milky Way. Answer the following questions: 1. How did astronomers pinpoint the center of the Milky Way? 2. Give two unusual definitions of a black hole as described in Chapter 2 of this video. 3. What does it mean when they say “gravity becomes a rip tide?” 4. What was the obstacle to viewing the galactic center and how was the obstacle overcome? 5. How massive is the black hole at the center of our galaxy compared to normal black holes? 6. Where do objects get “spaghettified”? 7. What has the Sloan Digital Sky Survey shown about black holes? 8. What is the role of galactic cannibalism in the structure of galaxies? 9. With which galaxy can the Milky Way collide and what will be the consequence? 10. Write your overall impression of this video. B. Go to and watch the video called The Great Photon Escape. Answer the following questions: 11. Was the Big Bang accompanied by a giant flash of light? 12. Why is the Cosmic Microwave Background also called the universe’s baby picture? 13. What was the age of the universe when the Cosmic Microwave Background emerged?


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