According to the theory of relativity, of course such a thing may happen, and it is reasonable.
Interstellar crossing is a movie several years ago. If I remember correctly, there is a scene in the movie where the protagonist comes to a planet. Since the planet is orbiting near a large black hole, according to general relativity, gravity It can affect time. The stronger the gravitational field, the slower the time will pass.
therefore has the setting of "one hour equals 7 years", and every hour the protagonist passes on the planet, the earth will pass 7 years.
As for some people wondering why there is still a complete planet near the black hole, why the protagonist is not torn apart when crossing the black hole horizon, the key is that the mass of the black hole is so large that the tidal force near the horizon is low enough , We must know that the tidal force is the cause of the broken object. Although the tidal force of
is low, it does not affect the nature of the event horizon as a one-way membrane (it seems like the black hole in the movie is a rotating black hole, there should be two horizons inside and outside, I can’t remember this setting clearly), that is Said that after the protagonist crossed the horizon, although he was still alive, he could no longer come back.
In addition to the influence of gravity on time, in the special theory of relativity, speed also has an influence on time. This should be a cliché for friends who are always concerned about the theory of relativity.
Simply put, if a spacecraft is moving fast relative to an observer (such as a person on the earth), then the observer’s time and the flow rate of the spacecraft’s time are inconsistent, and the spacecraft’s time passes slowly. If Dad is in the spacecraft, The daughter is on earth, so it is achievable that the father is younger than the daughter when they meet at the end of the journey.
Some people say this is a twin paradox? Sports are relative. Dad is younger than daughter, so daughter can be dozens of years younger than Dad! In fact, if the two are both inertial systems, this sentence is correct, but this also means that dad is gone forever and will never meet again. If
meet, then there must be a non-inertial system in this process, so the relativity of the conclusion is broken, only the father is younger than the daughter. (Note that the essential difference between the special phase and the general theory of relativity is whether space-time is curved, so the twin problem belongs to the special theory of relativity, and the non-inertial system is just the metric changed and does not affect space-time)
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