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Name ______________________________ Class ___________________ Date __________________ Skills Worksheet Directed Reading B, Chapter 19.2 Section: The Life Cycle of Stars THE BEGINNING AND END OF STARS Circle the letter of the best answer for each question. 1. What keeps a star from breaking apart? a. gravity b. energy c. mass d. density 2. During which stage of the life cycle is a star a ball of gas and dust? a. first stage b. second stage c. third stage d. last stage 3. What gas does hydrogen change into as a star becomes hotter? a. uranium b. helium c. gravity d. carbon DIFFERENT TYPES OF STARS 4. Which of the following is NOT a type of star? a. main-sequence stars b. supergiants c. white dwarf stars d. spectrum stars Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Science and technology 19 Stars, Galaxies, and the Universe Name ______________________________ Class ___________________ Date __________________ Directed Reading B continued Main-Sequence Stars Circle the letter of the best answer for each question. 5. What is the longest stage of a star’s life cycle? a. first b. second, or main sequence c. third d. last 6. What type of star generates a lot of energy? a. main sequence b. red giant c. white dwarf d. supergiant Giants and Supergiants 7. What type of star becomes large and cool as it loses hydrogen? a. main sequence b. red giant c. white dwarf d. red dwarf White Dwarfs 8. What type of star is the leftover center of an old star? a. main sequence c. white dwarf b. red giant d. supergiant 9. Which of the following stars is the oldest? a. main sequence c. white dwarf b. red giant d. supergiant Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Science and technology 20 Stars, Galaxies, and the Universe Name ______________________________ Class ___________________ Date __________________ Directed Reading B continued A TOOL FOR STUDYING STARS Circle the letter of the best answer for each question. 10. What two things are graphed on the H-R diagram? a. a star’s temperature and brightness b. a star’s temperature and color c. a star’s temperature and age d. a star’s temperature and size Reading the H-R Diagram 11. What is the name of the band where most stars are found? a. middle band b. absolute magnitude c. main sequence d. star path 12. Where are most stars found on the H-R diagram? a. top half b. bottom half c. far corners d. middle Read the description. Then, draw a line from the dot next to each description to the matching phrase. • • • • 13. top of modern H-R diagram 14. bottom of modern H-R diagram 15. right side of modern H-R diagram 16. left side of modern H-R diagram a. hot (blue) stars b. cool (red) stars c. dim stars d. bright stars Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Science and technology 21 Stars, Galaxies, and the Universe Name ______________________________ Class ___________________ Date __________________ Directed Reading B continued WHEN STARS GET OLD Supernovas Read the words in the box. Read the sentences. Fill in each blank with the word or phrase that best completes the sentence. pulsar supernova black hole neutron star 17. A huge explosion in which a large star dies is called a _____________________________. 18. A star made up of neutrons is called a _____________________________. 19. A spinning neutron star that emits pulses of energy is called a _____________________________. 20. An object so massive and dense that light cannot escape its gravity is called a _____________________________. Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Science and technology 22 Stars, Galaxies, and the Universe