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Name: ___________________ Period: ___________________ Date: ___________________ Study Guide Chapter 12 Stars, Galaxies, and the Universe 1. What is the electromagnetic spectrum? 2. What is a spectroscope? 3. What do astronomers use spectroscopes for? 4. What 3 things are used to classify stars? a. ______________________________ b. . ______________________________ c. . ______________________________ 5. What does the color of a star tell you? 6. What does each color represent? Blue: . ______________________________ White: . ______________________________ Yellow: . ______________________________ Red: . ______________________________ 7. How do stars form? 8. What is a supernova? 9. What are the differences between the 3 types of galaxies? Spiral: Elliptical: Irregular: 10. What is the Big Bang Theory? 11. What evidence do scientists look at to support the big bang theory? 12. Name: ___________________ Period: ___________________ Date: ___________________ What is a Black Hole and how do Black Holes form? 13. What force pulls together the matter in stars? 14. Describe the life-cycle of high-mass and low-mass stars. 15. What is apparent magnitude? 16. What is absolute magnitude? 17. What is a galaxy? 18. How do stars produce light and heat? 19. Explain the process of nuclear fusion. 20. What is the H-R Diagram and how does it work? 21. What is a light-year and when is its use most appropriate? 22. What is an astronomical unit and when is its use most appropriate? 23. List 5 facts about the Milky Way. (P.530) 1. Contains approx. 300 billion stars