The first 24 hours were tense. Having travelled through space for thousands of years, perhaps much much longer, it has reached its target destination, the habitable planet in our solar system. An extraterrestrial entity has come to us. Prologue The most important event in human history has occurred. The entity did not communicate or respond, it entered an orbit around Earth and waited. When it responded, it had already a basic understanding of our languages. It broadcast a message: "I am an a.
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