Answer:
Light year
Step-by-step explanation:
The distance between the stars is very large. The unit measure this distance should be very large. It is called light year.
One light year is defined as the distance traveled by the light in one year.
Speed of light is 3 x 10^8 m/s
Time taken is 1 year = 365 days = 365 x 24 x 60 x 60 = 31536000 second
By using the formula
distance = speed x time
distance = 3 x 10^8 x 31536000 = 9.46 x 10^15 m
Thus , one light year is equal to 9.46 x 10^15 m.