In ancient times, some people believed in immortality. Supposedly, with the progress of science and technology, there will not be many people who believe in immortality, but ignorance still exists and there are still many superstitious people. The proportion of people who directly believe in immortality may be less than that in ancient times, but there are still many people who indirectly believe in immortality. Changed its name because of immortality, and changed it to health care. If you look tall, you can give people a very reasonable look and fool one person after another.
Back to the journey to the west? One day in the sky, one year on earth? Originally, it was a manifestation of the worship of immortals by the ancients, but since Einstein gave the theory of relativity, someone has done it. One day in the sky, one year on earth? Find out the scientific basis. According to Einstein's special theory of relativity, the moving clock slows down. Satellites and spaceships in the sky are orbiting the earth at high speed, so it makes sense that time in the sky will slow down and immortals can live forever. And some people also take this opportunity to say that Wu Cheng'en discovered the theory of relativity.
However, according to the clock slow formula of special relativity, no matter how you calculate it, the mortals on the ground have spent a year, and the astronauts in the sky will never spend a day. Their time is similar to that of mortals on the earth. Relativity belongs to the scientific level. One day in the sky, one year on earth? It's just a myth that two things that don't match can't stick together.
As for whether people will grow old in space, many people have been in space and will grow old like mortals. People who have been in space don't want to live forever. They even risked their lives to pave the way for mankind to the universe. Only some people who are superstitious about immortality may think that they will grow old in space.