Multiple choice general knowledge 1 light year equals how many Kilometers? 31,557,600 km 5,878,625,373,183.608 km 9,460,730,472,580.8 km 3,000,00 km Reveal answer Fill a bubble to check yourself C Correct answer Explanation A light year is the distance light travels in one year. Since light travels at 299,792,458 m/s, in one year it covers approximately 9.46 trillion kilometers.