From the perspective of the universe, the probability of the existence of alien civilizations is basically 100%, and astronomers believe that alien civilizations exist. So as soon as human beings stepped out of the earth, they began a search plan for extraterrestrial civilizations
In the vast history of mankind, it has been sending messages to outer space without interruption, eagerly looking forward to communicating with aliens. As early as 1972, the Pioneer 10 and 11 spacecraft sent by the United States carried metal disks with human images and some basic information.
However, all attempts did not get any response. This also leaves us confused. Perhaps, in the vast universe, we must be lonely?
At the same time, there are more people who are afraid of such communication, and they seem that aliens are actually evil. In most movies, aliens come to Earth with a prey purpose, either for enslavement, or for resources, or to kidnap humans for experiments, or like "The Three-Body Problem", the dark forest law of hitting a shot without a reason.
In the latest research results, scientists believe that humans as a species are not currently ready to contact extraterrestrial civilizations because we lack sufficient knowledge and preparation, and for this reason, researchers in the Search for Extraterrestrial Intelligent Organisms Program recommend finding alternative strategies to further raise people's awareness of the universe, especially in terms of education.
Some researchers think we can't deal with it now if we find signals of extraterrestrial civilizations, because it involves some cosmological and religious issues, and it's clear that we're still not ready.
Astrophysicist Stephen Hawking once warned that contacting alien intelligent beings could lead to devastating consequences, which meant that human civilization was in crisis because alien civilizations could have more advanced technology and dubious intentions.
At our present stage, encountering a more advanced civilization, perhaps a bit like the original inhabitants of the Americas met Columbus, I don't think they would have been better off that way.
Imagine if there were a lot of resources in some primitive tribe on Earth, and modern humans went there with advanced weapons to plunder, and primitive people could not stop it.
But there are also those who disagree with Hawking. Alien civilizations capable of interstellar overflight have advanced enough that they may not need energy from Earth at all, but stellar energy, which is spread throughout the universe. In addition, aliens may not be able to survive in the Earth environment, they may not be carbon-based life like Earth life, and oxygen may be fatal to them.
Of course, there's nothing wrong with keeping a low profile of caution in the universe, and we don't know if the universe is a dark forest of dangers. But that doesn't stop us from searching for alien civilizations