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"SF looks towards an imaginary future, while fantasy, by and large, looks towards an imaginary past."
- Frederik Pohl

Ribbon World  
  A planet that presents the same face to its sun has a small habitable area - the ribbon between light and dark.  

Radole was a small world and, in military potential, perhaps the weakest of the twenty-seven. That, by the way, was another factor in the logic of the choice. It was a ribbon world of which the Galaxy boasts sufficient, but among which, the inhabited variety is a rarity for the physical requirements are difficult to meet. It was a world, in other words, where the two halves face the monotonous extremes of heat and cold, while the region of possible life is the girdling ribbon of the twilight zone. Such a world invariably sounds uninviting to those who have not tried it, but there exist spots, strategically placed and Radole City was located in such a one. It spread along the soft slopes of the foothills before the hacked-out mountains that backed it along the rim of the cold hemisphere and held off the frightful ice. The warm, dry air of the sun-half spilled over, and from the mountains was piped the water-and between the two, Radole City became a continuous garden, swimming in the eternal morning of an eternal June.
From Foundation and Empire, by Isaac Asimov.
Published by Doubleday in 1952
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