SCIENCE FICTIONSOMETHING IS ANSWERING.
The signal was not supposed to contain anything. Then someone noticed the interval repeating. Science fiction begins in moments like that: when possibility stops being theoretical and something on the other side of the question responds.
THE FIRST CLUE
THE STORY GETS STRANGER FROM HERE.
The machinery matters because of what it allows us to discover. A ship reaches somewhere it should not. A machine learns something nobody taught it. A distant world contains evidence that someone arrived first. The future becomes interesting the moment it stops behaving like a prediction.
ONE LAST THING
NOT EVERYTHING HAS BEEN FOUND.
If something has already sent the first message, deciding whether to answer may be the beginning of the story.
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