Question

define a light year ? why is the distance of star measured in light year ? a star in 5.3 light years away from Earth .what does it mean?​

Answer 1

Answer:

Light year is the distance covered by light in the given number of years.

Since the distance of stars from us is astronomically huge, an appropriate unit must be used that is not too small nor too large. Light year is an ideal unit for this.

By a distance of 5.3 light years, we mean the star is as far away from earth as the distance travelled by light in 5.3 years.