Question

70. A star is 20 light years from the Earth.
How much time does it take for the light
from the star to reach the Earth?
(A) 60 years
(B)20 years
(C) 20/3 years
(D) 15 years
​

Answer 1

Answer:

B) 20 years

Explanation:

A light year: An object with the speed of light complete a distance in a year is said to a light year