What If There Were an Alien Civilization on Proxima b?

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Attention human. You are receiving an interstellar radio transmission .And it could be coming from one of the nearest exoplanets, Proxima Centauri b. What conditions make this planet a candidate for alien life? What types of civilizations could have flourished there? And should we expect them to be knocking on Earth’s door any day now? What Is Earth Similarity Index (ESI)?

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