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Transcript
ASTRONOMY LIGHTYEAR 1. What is a lightyear? 2. What is the purpose of a lightyear? 3. State a “cool fact” about light. 4. What advantages are there for scientists to use lightyears? 5. How long does it take sunlight to reach the earth? 6. Why do astronomers want to use such a large unit of measure? 7. What is an AU? 8. What is a parsec? 9. What is the distance to our nearest star? 10. What is the distance to the nearest galaxy? 11. How big is our Milky Way? 12. What is the distance to the Crab Supernova? 13. What is parallax? 14. How is parallax measured? 15. When does parallax become useless in measuring distances? 16. How is an object’s size determined? 17. Give some examples of determining angular diameter.
