![]() In fact, it more than twice the size of the Earth’s moon. Ganymede is one of Jupiter’s satellites, or moons, and is the largest moon in the Solar System. Jupiter is the largest planet in the Solar System. The water ice is combined with the more abundant sulfur dioxide ice on Io’s surface. “This is the first strong evidence of solid water on the surface of this satellite,” said Dr. Scientists have found water molecules frozen in the surface ices of Jupiter’s moon Io. On the basis of Galileo’s data, some scientists have concluded that Io’s own magnetic field is driven by a subterranean magma ocean. Jupiter’s closest Galilean moon, Io, is the most volcanically active object in the solar system. Instead, it is shrouded beneath Jupiter’s massive magnetosphere. Unlike Earth, whose spinning iron core generates a planet-wide magnetic field, Io has no magnetic field of its own. The scientists focused on how the surface temperature of Ganymede varies strongly throughout the day, with highs of about minus 190 degrees Fahrenheit (minus 123 degrees Celsius) at noon at the equator and lows of about minus 315 degrees Fahrenheit (193 degrees Celsius) at night. Magnetosphere: Ganymede is the only satellite in the solar system to have a magnetosphere. However, it is too thin to support life as we know it it is unlikely that any living organisms inhabit Ganymede. It takes Ganymede about seven Earth-days to orbit Jupiter. Jupiter’s moon Ganymede has 46%, and Europa has 16% liquid water by volume. Ranking from least to most, the list includes: Enceladus, Triton, Dione, Pluto, Earth, with Europa, Callisto, Titan and Ganymede have the most liquid water by volume. He has ranked the worlds by how much liquid water they have. Around noon at the moon’s equator, it becomes warm enough for the icy surface to sublimate, or release small amounts of water molecules - which explains the differences seen in the ultraviolet images taken by Hubble. Ganymede’s surface temperature can vary significantly over the course of a day. 6 What is Ganymedes gravity compared to Earth?.
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