The speed of light in vacuum is approximately 299,792,458 meters per second. One Julian year is 365.25 days 24 hours/day 60 minutes/hour 60 seconds/minute = 31,557,600 seconds. Distance = Speed Time 1 light year ≈ 299,792,458 m/s 31,557,600 s ≈ 9.461 x 10^15 meters. Converting meters to kilometers (1 km = 1000 m): 9.461 x 10^15 meters = 9.461 x 10^12 kilometers. This value is approximately 9.461 trillion kilometers. Looking at the options, 9.5 trillion kilometers is the closest approximation.