In physics , the twin paradox is a thought experiment in special relativity involving identical twins , one of whom makes a journey into space in a high-speed rocket and returns home to find that the twin who remained on Earth has aged more .
The twin paradox in physics is a thought experiment in special relativity . It involves identical twins , one of whom makes a journey into space in a high-speed rocket and returns home to find that the twin who remained on Earth has aged more .