Form 7: What is a Light-Year? Exercise

Form 7: What is a Light-Year?

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Form 7: What is a Light-Year?

Understand the concept of a light-year as a unit for measuring distance in space.

Questions

  1. MultiChoice

    What physical quantity does a light-year measure?

  2. MultiChoice

    What is the exact definition of a light-year?

  3. MultiChoice

    What is the approximate speed of light in a vacuum?

  4. MultiChoice

    Roughly how many kilometers are in one light-year?

  5. MultiChoice

    Why do astronomers use light-years instead of kilometers?

  6. MultiChoice

    If a star is 4.2 light-years away, when was the light we see emitted?

  7. MultiChoice

    Because light takes time to travel, observing distant stars is like doing what?

  8. MultiChoice

    Approximately how many miles are in one light-year?

  9. MultiChoice

    What makes light a reliable ruler for cosmic distances?

  10. MultiChoice

    How long would starlight take to travel 10 light-years?

  11. MultiChoice

    Which unit is convenient for measuring distances within our solar system?

  12. MultiChoice

    What object or signal can travel faster than the speed of light?