LYCOS RETRIEVER 
Ganymede
built 655 days ago
As a child Ganymede was enrolled into cadet training, that took place in a base originally constructed by the Titans and Eternals. It was hidden deep within one of the moons of Jupiter. She spent years training in myriad varieties of military tactics and combat styles. While in the academy she developed a friendly rivalry with a fellow cadet Persephone. Both warriors participated in the final campaign that drove Tyrant from the galaxy. Following Tyrants defeat the Spinsterhood placed its members in suspended animation chambers in their moon bases or in Ganymede's case, a chamber disguised as space debris floating in an asteroid belt.
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Explanation: Ganymede's surface is slowly being pulled apart. This photo of Ganymede was released earlier today by the Galileo team at NASA. The Galileo Spacecraft arrived at Jupiter in December 1995. In late June, the spacecraft passed within 10,000 kilometers of Ganymede's icy surface, and took pictures showing complex surface details for the first time. The line-like features in this photo are sunlit ridges rising above Ganymede's ice-plains. The circular features are impact craters.
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Ganymede appears to have a differentiated internal structure, with a small molten iron or iron-sulfur core surrounded by a rocky silicate mantle with an icy shell on top. Its surface is a roughly equal mixture of two types of terrain: very old, highly cratered dark regions, and somewhat younger, lighter regions marked with an extensive array of grooves and ridges. Groove ridges as high as 700 meters (2,000 feet) have been observed stretching for thousands of kilometers. Their origin is clearly of a tectonic nature, but the details are unknown. In this respect, Ganymede may be more akin to Earth than is either Venus or Mars, though there are no signs of recent tectonic activity. The Galileo spacecraft discovered that Ganymede has a magnetic field.
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The large craters on Ganymede have almost no vertical relief and are quite flat. They lack central depressions common to craters often seen on the rocky surface of the Moon. This is probably due to slow and gradual adjustment to the soft icy surface. These large "phantom craters" are called palimpsests, a term originally applied to reused ancient writing materials on which older writing was still visible underneath newer writing. Palimpsests range from 50 to 400 km in diameter. Both bright and dark rays of ejecta exist around Ganymede's craters - rays tend to be bright from craters in the grooved terrain and dark from the dark cratered terrain.
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Much of scientists’ knowledge of Ganymede comes from spacecraft that have flown past the moon. In 1979 Voyager 1 and 2 passed close enough to Ganymede to produce detailed images of the moon. The Galileo spacecraft made its first flyby of Ganymede in June 1996 and came within 260 km (162 mi) of the moon in September 1996. Images from Galileo show a string of 13 craters that astronomers believe was created by the impact of a breaking comet. Images from Galileo ... suggest that volcanoes on Ganymede spewed hot water in the past, which melted down into the moon’s icy surface, creating channels and valleys. Astronomers hypothesize that the source of this hot water may have been a global liquid ocean located under the moon’s icy surface.
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Right: When Galileo flew past Ganymede in 1996, instruments on the spacecraft detected plasma waves that were the first evidence of Ganymede's magnetosphere. This image is a dynamic spectrogram showing the intensity of the waves as a function of frequency (vertical axis) and time (horizontal axis); red indicates high intensity waves and blue indicates low intensities. Scientists at the University of Iowa used the plasma waveform to generate a audio signal shifted 9 times downward in frequency from the natural frequency range of the plasma waves (near 80 kHz). Click for a 3.9 MB Quicktime movie of Ganymede's curious plasma wave sounds. A separate audio file (WAV 1.3MB) is ... available. Credits: Galileo Plasma Wave Science Team led by Prof. Donald A. Gurnett, University of Iowa.
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