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Name_________________________________________________ Date_________________ Period______________ DR 19.2 – p. 590 Section: The Life Cycle of Stars THE BEGINNING AND END OF STARS ______ 1. Which of the following statements is NOT true about stars? a. A star begins its life as a ball of gas and dust. b. As stars get older, they lose some of their material. c. Stars last forever. d. New stars form from the material of old stars. 2. During a star’s life cycle, hydrogen changes to helium in a process called ______________________. 3. When a star dies, either gradually or in a big explosion, much of its material returns to _____________. DIFFERENT TYPES OF STARS ______ 4. All of the following characteristics are used to classify stars EXCEPT a. age. c. brightness. b. name. d. temperature. ______ 5. Which one of the following is NOT true about stars? a. A star goes through many changes during its life cycle. b. A star can become a different type of star as it gets older. c. A star can be classified as more than one type of star during its life cycle. d. A star does not change during its life cycle. Match the correct description with the correct term. Write the letter in the space provided. ______ 6. small, hot star in final stage of its life cycle ______ 7. star in second and longest stage of its life cycle a. red giant star b. white dwarf star c. main-sequence star ______ 8. large, cool star in third stage of its life cycle 9. Explain how energy is generated in the core of a star during the second stage of its life cycle. _______________________________________________________________________________________________________ _______________________________________________________________________________________________________ 10. Explain what happens during the third stage of a star’s life cycle as the star uses up all of its hydrogen. _______________________________________________________________________________________________________ _______________________________________________________________________________________________________ 11. Explain the final stage of a star’s life cycle by describing what happens once a star has lost all of its hydrogen. _______________________________________________________________________________________________________ _______________________________________________________________________________________________________ A TOOL FOR STUDYING STARS ______ 12. The H-R diagram shows the relationship of a star’s temperature to its a. brightness. c. size. b. color. d. age. ______ 13. On what part of the H-R diagram would you find the majority of the main-sequence stars? a. top half c. middle b. bottom half d. far corners 14. According to the H-R diagram, the star Canopus has a temperature of about ______________________ and an absolute magnitude of ______________________. Match the correct description with the correct term. Write the letter in the space provided. ______ 15. top of modern H-R diagram ______ 16. bottom of modern H-R diagram ______ 17. right side of modern H-R diagram a. b. c. d. hot (blue) stars bright stars cool (red) stars dim stars ______ 18. left side of modern H-R diagram 19. Place these stars in order from earliest in life cycle to oldest in life cycle: red giant, white dwarf, main-sequence star. _______________________________________________________________________________________________________ _______________________________________________________________________________________________________ 20. As they age, ______________________ stars move up and to the right on an H-R diagram. Match the correct description with the correct term. Write the letter in the space provided. ______ 21. stars with low mass, low temperature, and low absolute magnitude ______ 22. small hot stars that are dimmer than the sun ______ 23. high-temperature stars that quickly use up their hydrogen ______ 24. cool stars with absolute magnitude ______ 25. stars in the band that runs along the middle of the H-R diagram WHEN STARS GET OLD ______ 26. Which one of the following statements is NOT true of supernovas? a. They are explosions in which a massive star collapses. b. They are explosions that occur at the beginning of a star’s life. c. They can be brighter than an entire galaxy for several days. d. They are explosions in which a star throws its outer layers into space. 27.A star that has collapsed under gravity is called a(n) ______________________. 28.A rapidly spinning neutron star is called a(n) ______________________. 29. An object so massive that light cannot escape its gravity is a ______________________. a. b. c. d. e. massive blue stars white dwarf stars main-sequence stars red dwarf stars red giant stars