Einstein's new theory with the speed of light being constant for every inertial observer had
amazing consequences. First, an object in motion shrinks in the direction of that motion
--
something called "length contraction." Second
, clocks in motion slow down
--
that is, they tick
-
tock slower. Third, the mass of an object in motion increases. The closer to the speed of light the
object moves, the shorter it is, the slower time passes, and the more massive it is.
