•speed of light = c = 3.0 ´ 108 m/s
•
•distance = speed ´ time
•d = c ´ t
•light-second = 3.0 ´ 108 m/s ´ 1 s
= 3.0 ´ 108 m
•light-minute = 3.0 ´ 108 m/s ´ 60 s
= 180 ´ 108 m
= 1.8 ´ 1010 m
•
•light-year =
3.0 ´ 108 m/s ´ 3.14 ´ 107 s (i.e. 31.4 million s) = 9.4 ´ 1015 m
= 9.5 ´ 1012 km
= 9.5 trillion
km
=
9,500,000,000,000 km