Light year is a measure of

The correct answer is Distance.

Concept:

Light year:

• The distance travelled by light in one year is called as light year.
•  It is the unit of astronomical distance.
• 1 light year = 9.461 trillion kilometers which is a very large distance.

Explanation:

• As light year is the distance travelled by light in a year so light year is a unit of distance. Hence option 2 is correct.

Important points:

• We can measure a very large distance with the help of light year. Thus light year is a unit for measurement of very large distance.