Isaac Asimov's short story "Nightfall," published in 1941, concerns the fate of the planet Lagash, which exists in a solar system with six suns. As a result, the planet has never known total darkness and the population has never seen a starry night sky. About every 2,000 years, however, the suns align in such a way that night falls on the planet -- with profound consequences for the people of Lagash. "Nightfall" wonders aloud about what happens when an insular society suddenly realizes it's part of a much, much bigger universe.
According to legend, the story came out of a debate between Asimov and John W. Campbell -- his editor at the magazine Astounding Science Fiction -- concerning a quote from Ralph Waldo Emerson: "If the stars should appear one night in a thousand years, how would men believe and adore, and preserve for many generations the remembrance of the city of God." Asimov and Campbell, suffice it to say, have a much more pessimistic take on the scenario.