Question

1) Consider a situation where immediately after birth, twins are separated. One continues to live on earth, while the other is whisked away by a space ship at 90% of the speed of light. After 65 years they are reunited. Will they look the same? Show proof of your answer through math

Answer 1

No they will not look the same.

Answer 2

They will not look the same, the one on earth will look 60 while the one in space will only look about 26.16 the equation is sqrt[1-(0.9)^2] = 0.436 .