•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