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The temperate moon Fides orbits its parent gas giant, Defensor. Its complex orbit causes the moon to be in its parent's shadow for more than a decade at a time, in Earth years. During these periods of perpetual night, the mean temperature of the surface of Fides plummets to about minus 35 degrees Fahrenheit (-37 degrees Celsius), which causes all multicellular life on the surface to sink into hibernation.
Due to tidal/gravitational friction, the temperature a mile below the surface is still pleasant and many burrowing life forms take their refuge down into the cave systems of the Fidean mountains, or at the ocean floor where water is still liquid.
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