Time Machine & Twin Paradox
Dilation in time that explains the Twin Paradox , Assume out of two twins one entered a Time Machine which is moving with a velocity of 0.9 c , where " c" is the velocity of light in vacuum then 40 years in the Time Machine corresponds to 92 years on earth ; that is of the twins the time traveler will be younger compare to his twin brother on earth This is Twin Paradox in special theory of relativity .