Those who are well aware of the theory of relativity also know that if the spacecraft is accelerated to near-light speed, then the time inside it will slow down. Imagine that there are passengers in such a ship. This ship flies, for example, to Sirius. This ship will fly there for ten years. However, passengers will feel that only a few days have passed. This effect is called time dilation. Having arrived back on Earth, the cosmonauts will notice that all their acquaintances have aged twenty years.
Now let's look at another effect that scientists are considering in theory. There is a speed limit in space, which states that nothing can travel faster than the speed of light. However, if there is any way to get around this limitation? Some scholars say that in this case, time could go backwards. This means that the ship can travel back in time. So it will be possible to go, for example, twenty years ago, thereby solving the problem that we had in the first example.
With this theoretical manipulation of time, perhaps in the future we can create a time machine.
Now let's imagine that somewhere in space there is a highly developed civilization that has already been able to create such a time machine. Aliens-representatives of this civilization flew to us on Earth. However, they did not arrive in our time, but even before the appearance of life on our Earth, with the help of this time machine. As a result, they created life on Earth, including us. It turns out they are our creators.
Now let's imagine that in the future we humans also learned to build spaceships that can fly to other star systems. We also learned how to build a time machine. We flew to the planet of our creators. However, we also decided to fly not to the present, but to the past of this planet, even before life was born there. And as a result, we created this very life. Later, these creators appeared. That is, it turns out that we became the creators of our creators.
This is how a temporary connection between the planets appears. Their inhabitants became each other's creators. That is, it was the time machine that connected them.
There were only two planets. However, there are billions of planets in our galaxy alone. Imagine that millions of them are inhabited by intelligent life and many are time machines. It turns out that all the planets can be somehow connected in time.
It turns out, in addition to the fact that aliens can have to fly to distant planets, they also have to travel in time. This means that they must comply with certain laws of time that preserve the causal continuum associated with time travel. It is these laws that prohibit thoughtless contact with the races of other planets. Perhaps for this reason, they cannot contact us either.
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This world may seem much more complicated than it seems to us people. Perhaps, in order to make contact with aliens, we ourselves must understand how these laws of time work, so as not to violate the causal relationships that may arise during this contact with aliens.
Imagine that you meet an alien. Then he suddenly decided to fly into your past and get to know your past version of you. However, you do not remember that you met with aliens before. This means that that alien is able to cause the paradox of time by his actions, and this should not be.
It is possible that UFOs that appear periodically can carry our friends from the future. This means that they cannot get to know us in the present. Therefore, they do not come into contact with us.
Here we need to somehow understand when exactly we should get to know each other in order to comply with the laws of time and not break the cause-and-effect relationship. Perhaps, having solved this problem, we will be able to openly contact them for the first time.