The galilean satellites were rst seen by the italian

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Unformatted text preview: ore numerous than the medium and large moons. Not enough gravity to be spherical: “potato-shaped” Captured asteroids or comets Jupiter’s Galilean Moons Io Europa Ganymede Callisto NASA/JPL/DLR 1000 km 17 This composite includes the four largest moons of Jupiter which are known as the Galilean satellites. The Galilean satellites were first seen by the Italian astronomer Galileo Galilei in 1610. Shown from left to right in order of increasing distance from Jupiter, Io is closest, followed by Europa, Ganymede, and Callisto. NASA/JPL Jupiter’s Io is the most volcanically active body in the solar system, but why? 18 Eruptions are so common and so large that the entire surface can be buried under 100 meters of material every 1 million years. This image, acquired by the Galileo orbiter, shows two volcanic plumes on Io. One plume was captured on the limb of the moon (see inset at upper right), erupting over a caldera (volcanic depression) named Pillan Patera. The plume seen by Galileo is 140 kilometers (86 miles) high an...
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