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Skills Worksheet
Directed Reading B Section: Galaxies (pp. 450–453) 1. A collection of stars, dust, and gas bound together by gravity is called
a(n)
.
TYPES OF GALAXIES Each of the following statements is true of a spiral galaxy, an elliptical galaxy, or an irregular galaxy. Write S for a spiral galaxy, E for an elliptical galaxy, and I for an irregular galaxy in the space provided.
______ 2. These galaxies have stopped making stars. ______ 3. The Milky Way is this type of galaxy. ______ 4. Some of these are formed when galaxies collide. ______ 5. The arms of these galaxies are made up of gas, dust, and new stars. ______ 6. These galaxies are round or oval, like cosmic snowballs. ______ 7. These galaxies can contain from 10 million to several billion stars. ______ 8. These galaxies have a bulge in the center and spiral arms.
CONTENTS OF GALAXIES ______ 9. A large cloud of gas and dust in interstellar space where stars are born is called a(n) a. globular cluster. b. open cluster. c. quasar. d. nebula. ______ 10. A highly concentrated group of up to one million stars is called a(n) a. globular cluster. b. open cluster. c. quasar. d. nebula. ______ 11. A relatively close group of up to 100 to 1,000 stars, usually located along the disk of a spiral galaxy, is called a(n) a. globular cluster. b. open cluster. c. quasar. d. nebula. Copyright Š by Holt, Rinehart and Winston. All rights reserved.
Holt California Physical Science
178
Stars, Galaxies, and the Universe