20.2 Concept Review - Physical Science

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20.2 Concept Review - Physical Science

Name ______________________________ Class ___________________ Date __________________20.2 Concept Review – The Milky Way and Other Galaxies1. List 3 components of a galaxy:a.b.c.2. Draw a sketch of the galaxy in which our solar system is located. Label the galaxywith its name.3. Define interstellar matter:4. Describe each of the following types of galaxiesa. Elliptical –b. Irregular –c. Spiral -5. What does the term “quasar” stand for?6. Describe a quasar:Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.Holt Science Spectrum 2 The Universe


Name ______________________________ Class ___________________ Date __________________7. What holds a galaxy together?8. Galaxies are classified by their __________________. They may be elliptical, spiralor irregular.9. Convert the following using dimensional analysis. Be sure to include a unit in youranswer. TO RECEIVE ANY CREDIT, YOU MUST SHOW ALL OF YOUR WORK!a. 4,500,000 m = ___ mmb. 0.000045 cm = ____ dmc. 5,000 km = _____cm10. Convert the following to scientific notation. Be sure to include a unit in youranswer.a. 4,500,000 m =b. 0.000045 cm =c. 5,000 km =Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.Holt Science Spectrum 3 The Universe

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