|Author||Stanley G. Weinbaum and Helen Weinbaum|
|Published in||Thrilling Wonder Stories|
|Media type||Print (Magazine)|
|Publication date||December 1938|
"Tidal Moon" is a science fiction short story by American writer Stanley G. Weinbaum and Helen Weinbaum that first appeared in the December 1938 issue of Thrilling Wonder Stories and was reprinted in the collection Interplanetary Odysseys (2006). Sam Moskowitz stated that Stanley G. Weinbaum completed only a page and a half of the story before his death and that his sister Helen Weinbaum completed the story on her own."Tidal Moon" is the only story by Weinbaum to take place on Ganymede.
In Weinbaum's Solar System, Jupiter radiates enough heat to create Earthlike environments on the Galilean moons. Ganymede, the third Galilean satellite, has a subarctic climate, large bodies of water, and a six-month rotation period. Due to Jupiter's tidal pull, every spot on Ganymede's surface is inundated with water every three months except a small area of the south pole where the human settlement of Hydropole is located. The Ganymedian natives, the Nympus, grow a mosslike plant called cree which is ordinarily red, but which turns blue when exposed to the ammonia in Ganymede's atmosphere. The blue moss is collected by human traders in the employ of Cree, Inc. who travel among the native villages on an aquatic riding animal called a hipp (short for Hippocampus catamiti); it is then shipped to Earth to produce crephine, a combined anaesthetic and medicine. Other Ganymedian life-forms include the whale-like Gamma Rorqual, the tentacled land leet, and the four-winged Blanket Bat.
Ben Amherst is a cree collector on Ganymede in the year 2083. Although he normally operates alone, he finds himself accompanied on one of his rounds by a tourist from Earth named Kirt Scaler. Scaler plans to travel with Amherst to the village of Aquia, then remain there for two months while Amherst continues on his rounds. Amherst finds Scaler strangely knowledgeable about conditions on Ganymede for someone who claims never to have left Earth before.
Reaching Aquia, Amherst and Scaler find that its chief trader, Carl Kent, has gone missing; his teenaged daughter Carol is carrying on in his place. Kent's disappearance is ominous since he has only recently worked out a process for distilling crephine from red moss. While Aquia is drowned in the flood, Scaler spends most of his time with Carol Kent.
A day and a half before the tide is due to ebb away from Aquia, Carol Kent discovers that her father's notes on his red moss distillation process are missing. Amherst remembers a rumour he heard that red moss has been discovered on Io; Scaler, he realizes, must be working for Ionian Products, a company seeking to break Cree, Inc.'s crephine monopoly. If they succeed, it will mean hard times for everyone on Ganymede. Aquia is searched for Scaler, to no avail. Suddenly one of the valves leading to the surface opens; Scaler is using it to escape Aquia with Carl Kent's notes. Amherst sends Kent to get him a vacuum suit; when she returns with it, she is wearing one herself. He tells her to remain in the settlement, but she ignores his order and follows him up the aqueduct.
On the still-half-flooded surface of Ganymede, there is no sign of Scaler, but Amherst and Kent see a rocket ship in the sky, coloured Ionian red. As the rocket nears the muddy ground, it lowers a ladder, then disappears behind a hill. When it reappears, a man is clinging to the ladder. It is Scaler, and Carl Kent's process is on its way to Io.
As they return to Aquia, Carol Kent tells Amherst about her father's process, which involves exposing red moss to ammonia and treating it with an extract from the eggs of Ganymedian gall-ants. Amherst is overjoyed: Ionian Products might have the process, but they don't have the gall-ants, and gall-ants can only breed on Ganymede. Carl Kent's notes will be worthless to the Ionians.
The Galilean moons are the four largest moons of Jupiter—Io, Europa, Ganymede, and Callisto. They were first seen by Galileo Galilei in December 1609 or January 1610, and recognized by him as satellites of Jupiter in March 1610. They were the first objects found to orbit a planet other than the Earth.
Jupiter is the fifth planet from the Sun and the largest in the Solar System. It is a gas giant with a mass one-thousandth that of the Sun, but two-and-a-half times that of all the other planets in the Solar System combined. Jupiter is one of the brightest objects visible to the naked eye in the night sky, and has been known to ancient civilizations since before recorded history. It is named after the Roman god Jupiter. When viewed from Earth, Jupiter can be bright enough for its reflected light to cast visible shadows, and is on average the third-brightest natural object in the night sky after the Moon and Venus.
Callisto, or Jupiter IV, is the second-largest moon of Jupiter, after Ganymede. It is the third-largest moon in the Solar System after Ganymede and Saturn's largest moon Titan, and the largest object in the Solar System that may not be properly differentiated. Callisto was discovered in 1610 by Galileo Galilei. At 4821 km in diameter, Callisto has about 99% the diameter of the planet Mercury but only about a third of its mass. It is the fourth Galilean moon of Jupiter by distance, with an orbital radius of about 1883000 km. It is not in an orbital resonance like the three other Galilean satellites—Io, Europa, and Ganymede—and is thus not appreciably tidally heated. Callisto's rotation is tidally locked to its orbit around Jupiter, so that the same hemisphere always faces inward. Because of this, there is a sub-Jovian point on Callisto's surface, from which Jupiter would appear to hang directly overhead. It is less affected by Jupiter's magnetosphere than the other inner satellites because of its more remote orbit, located just outside Jupiter's main radiation belt.
Europa, or Jupiter II, is the smallest of the four Galilean moons orbiting Jupiter, and the sixth-closest to the planet of all the 79 known moons of Jupiter. It is also the sixth-largest moon in the Solar System. Europa was discovered in 1610 by Galileo Galilei and was named after Europa, the Phoenician mother of King Minos of Crete and lover of Zeus.
Ganymede, a satellite of Jupiter, is the largest and most massive of the Solar System's moons. The ninth-largest object in the Solar System, it is the largest without a substantial atmosphere. It has a diameter of 5,268 km (3,273 mi), making it 26% larger than the planet Mercury by volume, although it is only 45% as massive. Possessing a metallic core, it has the lowest moment of inertia factor of any solid body in the Solar System and is the only moon known to have a magnetic field. Outward from Jupiter, it is the seventh satellite and the third of the Galilean moons, the first group of objects discovered orbiting another planet. Ganymede orbits Jupiter in roughly seven days and is in a 1:2:4 orbital resonance with the moons Europa and Io, respectively.
Farmer In The Sky is a 1950 science fiction novel by American writer Robert A. Heinlein about a teenaged boy who emigrates with his family to Jupiter's moon Ganymede, which is in the process of being terraformed. Among Heinlein's juveniles, a condensed version of the novel was published in serial form in Boys' Life magazine, under the title "Satellite Scout". The novel was awarded a Retro Hugo in 2001.
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Io, or Jupiter I, is the innermost and third-largest of the four Galilean moons of the planet Jupiter. It is the fourth-largest moon in the Solar System, has the highest density of all of them, and has the lowest amount of water of any known astronomical object in the Solar System. It was discovered in 1610 by Galileo Galilei and was named after the mythological character Io, a priestess of Hera who became one of Zeus's lovers.
Lucky Starr and the Moons of Jupiter is the fifth novel in the Lucky Starr series, six juvenile science fiction novels by Isaac Asimov that originally appeared under the pseudonym Paul French. The novel was first published by Doubleday & Company in August 1957. It is the only novel by Asimov set in the Jovian system.
Many parts of the outer Solar System have been considered for possible future colonization. Most of the larger moons of the outer planets contain water ice, liquid water, and organic compounds that might be useful for sustaining human life.
"The Mad Moon" is a science fiction short story by American writer Stanley G. Weinbaum, first published in the December 1935 issue of Astounding Stories. As did his earlier stories "A Martian Odyssey" and "Parasite Planet", "The Mad Moon" emphasizes Weinbaum's alien ecologies. "The Mad Moon" was the only Weinbaum story set on Io.
"Redemption Cairn" is a science fiction short story by American writer Stanley G. Weinbaum that first appeared in the March 1936 issue of Astounding Stories. "Redemption Cairn" is the only Weinbaum story set on Europa.
Jupiter's extensive system of natural satellites – in particular the four large Galilean moons – has been a common science fiction setting.
The magnetosphere of Jupiter is the cavity created in the solar wind by the planet's magnetic field. Extending up to seven million kilometers in the Sun's direction and almost to the orbit of Saturn in the opposite direction, Jupiter's magnetosphere is the largest and most powerful of any planetary magnetosphere in the Solar System, and by volume the largest known continuous structure in the Solar System after the heliosphere. Wider and flatter than the Earth's magnetosphere, Jupiter's is stronger by an order of magnitude, while its magnetic moment is roughly 18,000 times larger. The existence of Jupiter's magnetic field was first inferred from observations of radio emissions at the end of the 1950s and was directly observed by the Pioneer 10 spacecraft in 1973.
The exploration of Jupiter has been conducted via close observations by automated spacecraft. It began with the arrival of Pioneer 10 into the Jovian system in 1973, and, as of 2016, has continued with eight further spacecraft missions. All of these missions were undertaken by the National Aeronautics and Space Administration (NASA), and all but two have been flybys that have taken detailed observations without the probe landing or entering orbit. These probes make Jupiter the most visited of the Solar System's outer planets as all missions to the outer Solar System have used Jupiter flybys to reduce fuel requirements and travel time. On 5 July 2016, spacecraft Juno arrived and entered the planet's orbit—the second craft ever to do so. Sending a craft to Jupiter entails many technical difficulties, especially due to the probes' large fuel requirements and the effects of the planet's harsh radiation environment.
Volcanism on Io, a moon of Jupiter, is represented by the presence of volcanoes, volcanic pits and lava flows on the moon's surface. Its volcanic activity was discovered in 1979 by Voyager 1 imaging scientist Linda Morabito. Observations of Io by passing spacecraft and Earth-based astronomers have revealed more than 150 active volcanoes. Up to 400 such volcanoes are predicted to exist based on these observations. Io's volcanism makes the satellite one of only four known currently volcanically active worlds in the Solar System.
The Planetary series of stories by Stanley G. Weinbaum is series of short stories, published in Wonder Stories and Astounding Stories in the 1930s, which are set upon various planets and moons of the Solar System.
The exploration of Io, Jupiter's innermost Galilean and third-largest moon, began with its discovery in 1610 and continues today with Earth-based observations and visits by spacecraft to the Jupiter system. Italian astronomer Galileo Galilei was the first to record an observation of Io on January 8, 1610, though Simon Marius may have also observed Io at around the same time. During the 17th century, observations of Io and the other Galilean satellites helped with the measurement of longitude by map makers and surveyors, with validation of Kepler's Third Law of planetary motion, and with measurement of the speed of light. Based on ephemerides produced by astronomer Giovanni Cassini and others, Pierre-Simon Laplace created a mathematical theory to explain the resonant orbits of three of Jupiter's moons, Io, Europa, and Ganymede. This resonance was later found to have a profound effect on the geologies of these moons. Improved telescope technology in the late 19th and 20th centuries allowed astronomers to resolve large-scale surface features on Io as well as to estimate its diameter and mass.
Tidal heating of Io occurs through the tidal friction processes between Jupiter and its moon. Orbital and rotational energy are dissipated as heat in the crust of the moon. Io has a similar mass and size as the Moon, but Io is the most geologically active body in the Solar System. This is caused by the heating mechanism of Io. The major heating source of Earth and its moon is radioactive heating, but the heating source on Io is tidal heating. As Jupiter is very massive, the side of Io nearest to Jupiter has a slightly larger gravitational pull than the opposite side. This difference in gravitational forces cause distortion of Io’s shape. Differently from the Earth’s only moon, Jupiter has two other large moons that are in an orbital resonance with it. Io is the innermost of this set of resonant moons, and their interactions maintain its orbit in an eccentric (elliptical) state. The varying distance between Jupiter and Io continually changes the degree of distortion of Io's shape and flexes its interior, frictionally heating it. The friction-induced heating drives strong volcanic activities on the surface of Io.
The following outline is provided as an overview of and topical guide to Jupiter: