“如果有一对孪生兄弟,一个人留在地球上,另一个人乘宇宙飞船以光速作宇宙飞行一年,然后回到地球上,那么,留在地球上的人已变成白发苍苍的老人,而从宇宙归来者仍是翩翩少年。”多少年来,人们只要一谈起这个迷人的科学幻想故事,就情不自禁地想起相对论和他的创始人——世界最伟大的科学家爱因斯坦。 “If there is a twin brother, one of them staying on Earth and the other person flying in a spaceship at a speed of light of one year and then returning to Earth, the person who has remained on Earth has become a gray-haired old man , And those returning from the universe are still young. ”For years, people just could not help but think of Relativity and his founder, Einstein, the greatest scientist in the world, as soon as he started talking about this fascinating science fiction story.