'A 1972 experiment set this more precisely at 186,282 miles per second'
the speed of light
SPEED: A 1972 experiment set this more precisely at 186,282 miles per second
A 1972 experiment set this more precisely at 186,282 miles per second
A 1972 experiment set this more precisely at 186,282 miles per second
SPEED
the speed of light
SPEED