Question

The distance of a star from the earth is 8.33 light year .' What do you mean by this statement? Express the distance in metre.

Answer 1

Light year measures distance travel by light in one year and its approx value i.e,
1 Light year = 9.46×10^15 m
If distance of a star from Earth is 8.33 light year so it take 78.801×10^15 m
so it generally denotes the distance but as it is inconvenient to write such a large value in meter so such distances are measure in light year

Answer 2

Hey there!

The statement 'The distance of a star from the earth is 8.33 light minutes' means that the light from the star takes 8.33 minutes to reach earth.

Given,

Speed of light = 3 * 10^8 m/s

Distance covered in 1 sec = 3 * 10^8

Time taken = 8.33 min = 8.33 * 60 s

Distance = speed * time = 3 * 10^8 * 8.33 * 60 = 1.5 * 10^11 m

Hope It Helps You!