Why is the distance between stars expressed in light years? What do you understand by the statement that a star is eight light-years away from the Earth?
Light-year is a large unit and equals the distance travelled by light in one year. Hence, the large distances are expressed in light-years. If a star is located 8 light-years away from the earth, it means that the distance between the star and the earth is the distance light would travel in eight years.
