GENERAL KNOWLEDGE

Detailed explanation-1: -The term light-year is often used in astrophysics to measure the distance between two astronomical objects. Light travels at a velocity of about 300, 000 kilometres (km) per second. It can travel about 10 trillion km. More precisely, one light-year is equal to 9, 500, 000, 000, 000 kilometres.

Detailed explanation-2: -The main reason for using light years, however, is because the distances we deal with in space are immense. If we stick to miles or kilometers we quickly run into unwieldy numbers just measuring the distance to the nearest star: a dim red dwarf called Proxima Centauri that sits a mere 24, 000, 000, 000, 000 miles away!