Consider the following statements about the light year:
1. It is a unit to measure astronomical time.
2. Light year is a unit of distance.
3. A light-year is a distance that light travels in a vacuum in one Julian year.
Which of the statements given above is/are correct?
1
1, 2 and 3
2
1 and 2 only
3
2 and 3 only
4
1 only