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Skills Worksheet
Chapter Review
using key terms
The statements below are false. For each statement, replace the underlined term to make a true statement.
1.The distance that light travels in space in 1 year is called apparent magnitude.
2.Globular clusters are groups of stars that are usually located along the spiral disk of a galaxy.
3.Galaxies that have very bright centers and very little dust and gas are called spiral galaxies.
4.When you look at white light through a glass prism, you see a rainbow of colors called a supernova.
understanding key ideas
Multiple Choice
_____5.A scientist can identify a star’s composition by looking at
a.the star’s prism.
b.the star’s continuous spectrum.
c.the star’s absorption spectrum.
d.the star’s color.
_____6.If the universe expands forever,
a.the universe will collapse.
b.the universe will repeat itself.
c.the universe will remain just as it is today.
d.stars will age and die and the universe will become cold and dark.
_____7.The majority of stars in our galaxy are
a.blue stars. c. main-sequence stars.
b.white dwarfs. d. red giants.
_____8.Which of the following is used to measure the distance between objects in space?
a.parallax c. zenith
b.magnitude d. altitude
_____9.Which of the following stars would be seen as the brightest star?
a.Alcyone, which has an apparent magnitude of 3
b.Alpheratz, which has an apparent magnitude of 2
c.Deneb, which has an apparent magnitude of 1
d.Rigel, which has an apparent magnitude of 0
Chapter Review continued
Short Answer
10.Describe how scientists classify stars.
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11.Explain how stars at different stages in their life cycle appear on the H-R diagram.
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12.Explain the difference between the apparent motion and actual motion of stars.
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13.Describe two ways that scientists calculate the age of the universe.
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14.Making Comparisons Explain the differences between main-sequence stars, giant stars, super giant stars, and white dwarfs.
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15.Evaluating Sources According to the big bang theory, how did the universe begin? What evidence supports this theory?
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16.Evaluating Data If a certain star displayed a large parallax, what could you say about the star’s distance from Earth?
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Interpreting graphics
The graph below shows Hubble’s law, which relates how far galaxies are from Earth and how fast they are moving away from Earth. Use the graph below to answer the questions that follow.
17.Look at the point that represents galaxy A in the graph. How far is galaxy A from Earth, and how fast is it moving away from Earth?
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18.If a galaxy is moving away from Earth at 15,000 km/s, how far is the galaxy from Earth?
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19.If a galaxy is 90,000,000 light-years from Earth, how fast is it moving away from Earth?
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Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Holt Science and technology1Stars, Galaxies, and the Universe