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Date
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Section 2-2: The Life Cycle 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 ____________________.
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 like our sun during the main sequence stage of its life
cycle.
___________________________________________________________________________________
___________________________________________________________________________________
10. Explain what happens during the red giant stage of a star like our sun’s life cycle.
___________________________________________________________________________________
___________________________________________________________________________________
11. Explain what happens during the white dwarf stage of a star’s life cycle.
___________________________________________________________________________________
___________________________________________________________________________________
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 high absolute magnitude
a.
b.
c.
d.
e.
massive blue stars
white dwarf stars
main-sequence stars
red dwarf stars
red giant stars
____________ 25. stars in the band that runs along the middle of the H-R diagram
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 _____________________.
SECTION 2-2 Vocabulary In your own words, write a definition for each of the following terms in the space provided.
1 Red Giant __________________________________________________________________________
2 White Dwarf _______________________________________________________________________
3 H-R Diagram _______________________________________________________________________
4 Main Sequence______________________________________________________________________
5 Supernova _________________________________________________________________________
6 Neutron Star ________________________________________________________________________
7 Pulsar _____________________________________________________________________________
8 Black hole _________________________________________________________________________
EXPLAIN HOW SIZE DETERMINES WHAT WILL HAPPEN AT THE END OF A STAR’S LIFE?
HOW WILL OUR SUN END IT’S LIFE?