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With 400 billion stars in the Milky Way galaxy alone, could ours be the only one with an inhabited planet? How much more likely it is that the galaxy is throbbing and humming with advanced societies. Perhaps near one of those pinpoints of light in our night sky, someone quite different from us is glancing idly at the star we call the sun, and entertaining just for a moment, an outrageous speculation.— Carl Sagan
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