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12/10 Do First – p.105

12/10 Do First – p.105. What is a light year? Why are light years used in astronomy? Copy the questions above into your comp book on page 105. Answer the questions using complete sentences. Add the title “What is a Light Year?” in your table of contents. Today’s Schedule December 10, 2010.

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12/10 Do First – p.105

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  1. 12/10 Do First – p.105 What is a light year? Why are light years used in astronomy? Copy the questions above into your comp book on page 105. Answer the questions using complete sentences. Add the title “What is a Light Year?” in your table of contents.

  2. Today’s Schedule December 10, 2010 • Agenda: • Do First: What is a light year? • Light Years vs. Student Minutes • Revise Your Ideas • Test Review Homework: 3rd 6 Weeks Test Review Sheet (due NEXT Wednesday, December 15) Announcements: 3rd 6 Weeks Test – December 15 Comp Book Check Next Week Essential Questions: What does a light year measure, and why do we call it that? Why are light years used in astronomy?

  3. Light Years • The distance that light travels in a year is a light year. A light year is a DISTANCE! • Light years are useful because they measure very large distances.

  4. Light Years The distance that light travels in a year is a light year. A light year is a DISTANCE! • The distance from the Earth to the Sun is 150 million km. • The closest star to the sun is 4.3 light years away. • The Milky Way Galaxy is 100,000 light years across. • The sun is located 30,000 light years from the center of the Milky Way Galaxy. • The closest galaxy to the Milky Way is the Andromeda Galaxy located 2.5 million light years away.

  5. Light Years vs. Student Minutes • You will measure how far you can travel in 15 seconds moving heel to toe. • You will use this information to calculate a “student minute.” • Think: • How many student minutes would it take you to walk from O. Henry to places like Zilker Park, 7-11, the Texas Capitol Building, California? • Light years are useful because they measure very large distances. Are student minutes a useful measurement for large distances?

  6. Conclusion Questions • Answer the questions on the back of your lab sheet. Be sure to use complete sentences. • During this activity you were measuring a light year. What represents the light and what represents the year? • Why do astronomers use light years to instead of kilometers to measure distances in the universe? • If a star located 65 years away from Earth stops giving off light energy at this very moment, how long will it be before we can know it? Explain.

  7. Revise Your Ideas – p.105 What is a light year? Why are light years used in astronomy? Using what you learned today in our investigation, revise your answers to the Do First questions.

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