Question

a unit for measuring very large distance is called a light year. it is called a light year. it is the distance covered by light in one year. express light year in metres. take speed of light as 3*10 ki power8ms-1

Answer 1

The light-year is a unit of length used to express astronomical distances and measures about 9.46 trillion kilometres (9.46 x 1012 km) or 5.88 trillion miles (5.88 x 1012 mi).[note 1] As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in vacuum in one Julian year (365.25 days).[2] Because it includes the word "year", the term light-year may be misinterpreted as a unit of time.[3]