Question

In the context of space, a 'Light Year' is ______.

a. A unit of time
b. A unit of length
c. A unit of mass
d. A unit of force

Answer 1

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b. A unit of length

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Answer 2

In the context of space, a light year is a unit of length.

This unit of distance is basically electromagnetic based radiation which encompasses in terms of 1 earth year.

In the 19th century, this unit of the light year was first proposed.

The speed of light inside a vacuum or earth year is a concept which is used for defining Julian year 365-25 days.