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Date
Stars, Galaxies, and the Universe
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Class
Review and Reinforce
Star Systems and Galaxies
Understanding Main Ideas
The figure below shows three star systems as they might be seen from Earth.
Ellipses indicate orbits. Answer the questions in the spaces provided.
A
B
c
1. Which star system is an eclipsing binary? ___________________________________
2. What kind of star system is A? ____________________________________________
3. The dim, tiny, but high-mass star in C is not visible from Earth. How
could astronomers infer that it exists? ______________________________________
Building Vocabulary
Write a definition for each of the following terms on the lines below.
4. binary star ___________________________________________________________
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5. eclipsing binary ______________________________________________________
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6. open cluster __________________________________________________________
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7. globular cluster _______________________________________________________
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8. spiral galaxy
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9. elliptical galaxy _______________________________________________________
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10. irregular galaxy ______________________________________________________
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11. quasar ______________________________________________________________
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