Light Year: Definition & Overview


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question 1 of 3

A light year is a measure of time.

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1. There are three objects in the sky. Object A is 5.5 light years from us, Object B is 10 light years away, and Object C is 15 light years away. Which object will take the longest to reach?

2. If we had a way to travel as fast as the speed of light, will we survive a trip to Andromeda?

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About This Quiz & Worksheet

A light year is a term often confused for something it is not, and this quiz/worksheet will help you test your understanding of what it really is and the significance of its measurement.

Quiz & Worksheet Goals

In these assessments you'll be tested on the definitions, calculations, and implications of:

  • Light years
  • The speed of light

Skills Practiced

This quiz and worksheet allow you to test the following skills:

  • Defining key concepts - ensure that you can accurately define a light year
  • Distinguishing differences - ensure you can differentiate between what a light year does and does not measure
  • Problem solving - use acquired knowledge to solve practice problems involving the implications of light year measurement

Additional Learning

To learn more about the measurement of light years, review the accompanying lesson titled Light Year: Definition & Overview. This lesson covers the following objectives:

  • Define light year and understand what it measures
  • Familiarize yourself with the speed of light
  • Know how to calculate a light year in meters and miles
  • Know the distance from the Sun to each planet in our solar system in light years