Consider the following statements about Light year : 1. Light year is a unit for measurement of very large distances. 2. Light year is a unit for measurement of very large time intervals. 3. Light year is a unit for measurement of intensity of light. Which of the statements given above is/are correct ?

- Light-year, in astronomy, the distance traveled by light moving in a vacuum in the course of one year, at its accepted velocity of 299,792,458 metres per second ( 186,282 miles per second). - A light-year equals about $9.46073 \times 10^{12} \mathrm{~km}$ ( $5.87863 \times 10^{12}$ miles), or 63,241 astronomical units. - It is a unit of distance. It is the distance a light photon travels in the vacuum in one Julian year. Denoted byly. - It's defined by how far a beam of light travels in one year - a distance of six trillion miles.