Download 01 - Awtrey Middle School

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
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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
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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