Answer: 9.45 x 10^15 m
Step-by-step explanation:
The speed of light = 300,000,000 m/s (3·00 × 10^8m/s).
Length of Earth year = 365 days
= 365 × 24 × 60 × 60 seconds = 3·15 × 10^7seconds
Now speed = distance / time ...
so ... distance = speed × time
So: 1 light year = 3·00 × 10^8 × 3·15 × 10^7
1 light year = 9·45 × 10^15 m
That's nearly 9 1/2 million, million kilometres!
