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Ithaca Chasma
Ithaca Chasma is a valley (graben) on Saturn's moon Tethys, named after the island of Ithaca, in Greece. It is up to 100 km wide, 3 to 5 km deep and 2,000 km long, running approximately three-quarters of the way around Tethys' circumference, making it one of the longer valleys in the Solar System. Ithaca Chasma is approximately concentric with Odysseus crater.
Ithaca Chasma may have originated when the water ocean inside Tethys froze. This would have caused the surface to crack in order to accommodate the resulting increase in volume. Another hypothesis is that Ithaca Chasma is the outermost ring of the Odysseus impact basin. The Chasma is 4 to 0.4 billion years old, and slightly older than Odysseus.
== Discovery ==
Ithaca Chasma was discovered by Voyager 1 spacecraft on 12 November 1980 during its flyby of Saturn. However its full extent was realized only in 1981 after the Voyager 2 flyby. It was named after the island of Ithaca, in Greece.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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