Final answer:
A light-year is the distance that light travels in one year, and it is equivalent to 9.46 x 10 12 kilometers.
Step-by-step explanation:
A light-year is the distance that light travels in one year. Light travels at a speed of 300,000 km/s, which is equivalent to 3 x 10^5 kilometers per second. To calculate the number of kilometers in a light-year, we need to know how many seconds are in a year. There are 60 seconds in a minute, 60 minutes in an hour, 24 hours in a day, and 365 days in a year. Multiplying these numbers together, we have 60 x 60 x 24 x 365 = 31,536,000 seconds in a year.