EVERYDAY SCIENCE

Detailed explanation-1: -A light year is the distance a photon of light travels in one year, which is about 6 trillion miles (9 trillion kilometers, or 63, 000 AU ).

Detailed explanation-2: -Hence, the distance between stars is expressed in the light years as it is complicated to express the distance in kilometers and eight light years is the distance traveled by the light in eight years. The distance between the star and the Earth which is eight light-years away from the Earth is ✕ 6 ✕ 10 13 km .

Detailed explanation-3: -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. So, the distance between the earth and star = 8 ✕ (9.46 ✕ 1012) = 7.6 ✕ 1013 km.

Detailed explanation-4: -The Light-year is a unit of length used to express astronomical distances and is equivalent to about 9.46 trillion kilometres (9.46×1012 km) or 5.88 trillion miles (5.88×1012 mi).

Detailed explanation-5: -This unit of distance is termed the parsec, defined as the distance of an object whose parallax equals one arc second. Therefore, one parsec equals 3.26 light-years.