Pulp Inspirations: Uranus from Captain Future

Uranus figures prominently in the Captain Future story The Magician of Mars published in 1941. Here are some details on Hamilton's version of Uranus, which is not at all scientifically accurate, but very useful for gaming inspiration. Quotes are provided from the issue of the pulp magazine.

Geography

• Mountains are Uranus's best known feature.
• Mystery Mountains: "And there is one colossal range in the northern hemisphere, called the Mystery Mountains, which have an altitude of at least twenty miles and possibly much more."
• "The Mystery Mountains’ eternally cloud-wrapped upper heights have never been explored. It is believed that strange creatures inhabit those lofty hidden heights, since occasionally men have found grotesque bodies floating down the North River that flows from those mountains toward the Polar Sea."
• Meteor Peak: "In the wilds south of Losor is the remarkable mountain called Meteor Peak. It is not a natural mountain like the other peaks of Uranus, but is in fact a huge meteor which fell there in times past and half -buried itself in the ground. Because of its unique metallic nature the meteor did not shatter, and still rises from the wilds as a great, dome-like mass of metal. It has sometimes been used as a quarry for certain metals, but that has now been prohibited."
• Valley of Voices: "...in the Valley of Voices, sheets of a talc-like material exuded from the cliffs seem to have the power of recording in some way any sound vibrations which fall upon them. These queer talc-sheets, whenever the wind strikes them, give forth all the sounds they have “recorded.” The result is that in the Valley of Voices one can still clearly hear sounds and human voices which are echoing after thousands of years."
• Endless River: "It was a foaming river that roared ceaselessly around the planet in the titanic canyon it had eroded for itself, its current being the result of tidal pull of the four moons."
• Shining Sea: "It is a sea whose waters are so impregnated with radioactive material from deposits in its bed that it glows at night like a great lake of light. The Uranian city of Lulanee is built on the shores of the Shining Sea, and is considered by inter- planetary travelers to possess one of the most beautiful settings of any city in the System."
• The Great Caves: "Beneath the surface of the planet is a natural wonder almost as great as the mountains, the great caves of Uranus. The interior of the planet is honeycombed by a labyrinth of caverns unmatched anywhere else in the System...Men have explored some of the upper caverns. There is a tiny amount of light in them, emitted from the radioactive minerals in which Uranus is rich. And there is a whole range of life-forms that exist in the caverns and never emerge into the sunlight."

Lifeforms

• Floating Flowers: "Perhaps the most distinctive plant-life of Uranus are its Floating Flowers — flowers that drift in the air by means of sacs into which pure hydrogen is exuded, and whose trailing air-roots supply them with water and nutrition from the air."
• "The animal life of Uranus is abundant, and comprises many of the most ferocious carnivores in the System."
• Cliff Apes: "are the most dreaded, being not really apes but huge bear-like animals whose six limbs are adapted for clambering over the sheer precipices."
• Cloud Cats: "haunt the cloud-wrapped up- per heights of the peaks, and stalk their prey in the eternal mists."
• Thunder-hawk: "has vast wings which can shadow a whole village and can carry off huge beasts in its claws."
• Harpies: "Their human-like appearance is mere accident, and they are in no way as intelligent as the Qualus, the famous winged men of north Saturn."
• Uranians: "have yellow skins, dark hair, and small, dark eyes." 
• "they are perhaps the most conservative and tradition-ridden people in all the nine worlds. They revere custom, and practice a suave courtesy that most people find rather wearying."
• "they are perhaps the most skilled miners in the System, due to their long acquairitance with the underground labyrinth of their world."
• People of Darkness: "humans of a primitive kind who dwell in the caves and are known as the People of Darkness. They are presumed to be descendants of Uranian stock who ages ago went down into the caves and developed eyesight capable of seeing well there. These People of Dark- ness never appear on the surface. Intense light dazzles them."