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The Life Cycle of Stars—Answer the questions on pg. 94 and 95 of your notebook. Task #1: Lights in the Sky Go to the website http://www.seasky.org/cosmic/sky7a01.html and answer the following questions: 1. What are constellations? 2. What is a star's brightness known as? 3. How do astronomers rate the magnitude of a star? 4. Are the brightest stars low magnitude or high magnitude? 5. Stars are identified by their color; what does the color indicate? 6. What color is the hottest star? 7. What color is the coolest star? 8. a. Use colored pencils to color the Spectral class types. Color the hottest stars on the left to the coolest stars on the right. b. Label the spectral classes appropriately under each star (G, B, F, A, O, K, M) Spectral Class Types for Stars _______ _______ ______ ______ ______ Task #2: A Nuclear Furnace Continue to read on to the section “A Nuclear Furnace” on the same webpage http://www.seasky.org/cosmic/sky7a01.html and answer the following questions: 1. The nuclear reactions inside a star, such as our sun, convert hydrogen into helium by means of a process known as. 2. What gives a star its energy? 3. How many protons does a standard hydrogen atom have in its nucleus? ______ ______ . Task #3: The Circle of Life Continue to read on to the section “The Circle of Life” on the same webpage http://www.seasky.org/cosmic/sky7a01.html and answer the following questions: 1. Stars begin their lives as clouds of dust and gas called_____________. 2. What is a protostar? 3. When does nuclear fusion begin? 4. The life span of a star depends on _________________________. 5. When will a star become a red giant? 6. Why do some stars become super red giant? 7. What will happen when a star exhausts its remaining fuel? 8. What is a planetary nebula? 9. What is a white dwarf? 10. What is a black dwarf? 11. How does a star become a neutron star? 12. Using colored pencils, draw a diagram of the life cycle of a star: