Question

The distances between the various celestial objects are usually expressed in the unit of:
A. kilometres
B. light minutes
C. light years
D. light seconds

Answer 1

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C. light years

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Answer 2

The distances between the various celestial objects are usually expressed in the unit of C. light years

Explanation:

Light year is unit of length used to measure astronomical distance.

One light year is the distance travelled by light in one Julian year.

1 Light year = 9.46 trillion kilometres

Abbreviations used to define light year include ly (one light-year), kly (kilolight-year), Mly (megalight-year) and Gly (gigalight-year).

Light minutes and light seconds are astronomical unit which is used to measure distance. But these units are smaller compared to light year. So, light year is always used.