Integrated Science
Integrated Science
7th Edition
ISBN: 9780077862602
Author: Tillery, Bill W.
Publisher: Mcgraw-hill,
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Chapter 12, Problem 1CQ

What is a light-year, and how is it defined?

Expert Solution & Answer
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To determine

The significance of light year and its definition.

Answer to Problem 1CQ

A light-year is a unit of length used to measure the astronomical distances. It is defined as the distance travelled by the light in 1 year. One light year is equal to 9.5×1012km.

Explanation of Solution

In astronomy, there were no referent points of comparison so that standard units were created for the measurement of distances. A light-year is a unit of length which is used to describe the astronomical distances.

Therefore, a light year is the distance travelled by the light in 1 year. One light year is equal to 9.5×1012km.

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