Light year is the unit of the (1) Distance (2) Time (3) Speed (4) Intensity of light

Answer: (1)

A light-year is a unit of distance. It is the distance a light photon travels in the vacuum in one Julian year. Denoted by ly. The value of the one-light year is constant.

The value of one light-year can be numerically expressed in kilometres as:

One light-year, ly = 9.4607 × 1012 km.

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