Concept information
Terme préférentiel
Ganymede
Définition(s)
- Ganymede is the largest satellite of Jupiter and of the entire solar system, slightly bigger even than Mercury (but with only half its mass) and three-quarters the size of Mars. It was discovered by Galileo and, independently, by Simon Marius in 1610. 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 m (2,000 ft) 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. (Encyclopedia of Science, by David Darling, https://www.daviddarling.info/encyclopedia/G/Ganymede.html)
Concept(s) générique(s)
Synonyme(s)
- Jupiter III
Traductions
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français
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Jupiter III
URI
http://data.loterre.fr/ark:/67375/MDL-C0BHBM8K-7
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