Question

If the speed of light is 300,000 km/s, how many kilometers (km) are in a light-year (ly)? Show all your work.

Answer 1

300,000 km/s × Distance traval by light in one year

300,000 × 365days

300,000 × 365 × 24

300,000 × 365× 24 × 60

300,000 × 365× 24 × 60 × 60

9.46 × 10¹²