The fact is that there is always the possibility that aliens attack. Stephen Hawking warned about that thing. And the alien invasion can be destructive. The fact is that the alien race can destroy us accidentally. In one scenario those aliens might make the crash landing on Earth by using a spacecraft that uses a black hole for the power source. In that scenario the chamber where that black hole is. Could be broken. And that black hole destroys the entire life and pulls Earth in it.
In some other scenarios, the aliens misunderstand our messages. And then they would answer by using the extremely powerful transmission that will break the entire Earth immediately. The fact is that many people would not believe that an interstellar civilization would want to conquer Earth. But they can destroy Earth on purpose or they can make some humans their slaves.
The idea is that the aliens would send the nanomachines to Earth. And then they can take people into their control. But for those aliens, the Earth would be too complicated to conquer, because of the viruses and bacteria. The thing that the alien space travelers who might spend even thousands of years in space could want is genetic material. They would want to take genomes and connect those genomes to their DNA. That thing denies the degeneration. The fact is that this type of space traveler could be dangerous.
The civilization that just created an interstellar traveling is the civilization that would destroy or attack us with the highest probability. If those colonists or space travel think that humans are some kind of threat to them. They can open fire. Or that kind of civilization could be so in a sense of strength that it can think that weapons are the right way to communicate.
There are theories and hypotheses that some air forces are captured alien probes. Or something like that. The fact is that nobody confirmed those tales. But the unmanned alien probe would not be very big. The fact is that the alien probes or alien spacecraft would give new ideas for aviation and other engineers. So there is a possibility, that if some alien craft is captured that information will be kept in secrecy.
The SETI (Search For Extraterrestrial Intelligence) program is created to find out, what kind of civilizations there is in the Milky Way. The only known civilization is officially human civilization. But the SETI program is much more than just a search for extraterrestrial intelligence. It's the forum where researchers can make models for long-term space missions. Maybe SETI will find the alien civilization someday in the future.
But the SETI program is also allowed to make models of what kind of future humans might have. The alien attack can look like pure theory, but there is always the possibility that some civilization makes the decision, that they want to attack humans. So we must prepare also for this kind of threat.
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