Can multi-species civilization be possible in the universe?

When we are thinking about the situation that the alien race will meet another alien race there are two possibilities. The first possibility is that those alien species are starting diplomatic relations and the second possibility is that they will go to war. The thing is that the technically advanced civilizations that can travel to another solar system should realize that the war between civilizations would be deadly or at least causes extreme damage.

The requirement for contact with aliens is interstellar travel. Without interstellar travel, contact is impossible on the physical level. But if the species is highly advanced it can create extremely powerful lasers that can cause damage even on an interstellar scale. The interstellar laser system can base on a mirror or a large group of mirror satellites. That is pointing their radiation to one large laser system.

The advanced civilizations must have some kind of technology that can use as a weapon. The lasers that are planned to use to push solar sails to Alpha Centauri can turn into weapons. And that is the thing that causes criticism against that project The interstellar lasers would be far more powerful than those lasers that are planned to use to send solar sail to Alpha Centauri.

Those systems are needed to protect civilizations against meteorites. And they can use laser or antimatter technology.

This is the reason why the interstellar- or Kardashev-scale 2+ civilizations would probably choose communication and diplomacy. Things like Death Stars and antimatter weapons are the things that might help to tolerate each other when the interstellar civilizations are meeting.

So the interstellar civilizations are probably not a threat to each other. Interstellar travel requires a certain type of behavior, and that means those aliens would remove aggressive behavior from their race. That thing can happen by using genetic engineering, where aggression and narcism are removed from their genomes.

But as we see aggressive behavior and things like willing to destroy the other species depends on the culture. The thing is that the interstellar civilizations must be mature enough that they finish their wars and start to work for the goal that gives them the ability to travel to the stars. The highly advanced technology makes those species hard to destroy.

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