出典:Wikipedia
出典:『Wikipedia』 (2009/05/19 06:51 UTC 版)
Equatorial ridges are a feature of at least three of Saturn's moons: the large moon Iapetus and the tiny moons Atlas and Pan. They are ridges that follow closely the moon's equator. They appear to be unique to the Saturnian system, but it is uncertain whether the occurrences are related or a coincidence. All three were discovered by the Cassini probe in 2005.