If humans come into contact with aliens of the same civilization, what impact will it have on the earth?

Assuming that the problem of interstellar communication has been solved, we will discuss this problem again. The influence will definitely be various, involving politics, military affairs, science and technology, economy, culture, religion and so on.

First of all, politically, in order to counter the technological monopoly and communication monopoly of the western camp, other countries in the world may form multiple alliances, each enjoying scientific research achievements, scientific research talents, industrial resources and productivity in the interstellar era. You can refer to the space war between the East and the West during the Cold War.

Contact with aliens will first determine whether their attitude towards us is friendly or hostile. We should also take into account that since alien civilizations have been discovered, there must be the possibility of other alien civilizations. Are those undiscovered alien civilizations friendly or hostile? Is the level of civilization higher or equal to ours? When we communicate with each other through interstellar communication, it is equivalent to exposing our position and civilization. What are the consequences? Next, I will refer to Liu's "Three-body" dark forest theory, so the most correct way to deal with it politically is not to touch each other.

In terms of science and technology, countries are bound to increase investment in scientific research in interstellar communication, navigation, military and other fields, especially controlled nuclear fusion and other clean and lasting power sources.

Culturally, if the other side's culture is understandable and acceptable to us, there will be great cultural exchanges and integration, especially a wave of movies, music and literary works with the theme of alien civilization, which will support a group of tabloids and self-media. It's very popular. Referring to the incident of Martians broadcasting Oolong in the 1970s, a wave of movies and literary works with Martians as the theme appeared, leading an era.

Religiously, it should be an impact on the existing religious system, which is hard to say.