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Iapetus is heavily cratered, and Cassini images have revealed large impact basins, at least five of which are over 350 km (220 mi) wide. The largest, Turgis , has a diameter of 580 km (360 mi); [24] its rim is extremely steep and includes a scarp about 15 km (9.3 mi) high. [25]
Iapetus has a bright and a dark hemisphere, with a ridge running along its equator. The dark region is called Cassini Regio and is the principal feature of the leading hemisphere. The surface of Iapetus is heavily cratered, with large impact basins up to 580 kilometres across.
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The heavily cratered surface of the ridge implies that it was formed very early in the history of Iapetus. Models suggest that it was formed by motions of a thin, active ice lithosphere when deeper layers of the moon were warm.
Scientists have long wondered why one hemisphere of Iapetus is so dark in comparison to its other hemisphere, and in comparison to other surfaces in the Saturn system. Iapetus may be sweeping up particles from the more-distant dark moon, Phoebe.
Oct 5, 2021 · Looking at the rest of Iapetus, there are a few other features that are notable, although not exactly uncommon for the solar system. Iapetus possesses a heavily-cratered
- Ethan Siegel
Oct 15, 2007 · Near upper left is a large crater with terraced walls, a mostly flat floor and a prominent group of peaks in its center. The sharp features make this likely one of the youngest craters in this area of Iapetus. Cassini imaged another similarly flat-floored and relatively fresh crater during its Dec. 2004 Iapetus flyby (see Giant Landslide on ...
Jan 7, 2005 · Iapetus: A View from the Top. Jan. 7, 2005. This oblique view of Saturn's moon Iapetus from high latitude shows how the dark, heavily cratered terrain of Cassini Regio transitions to a bright, icy terrain at high latitudes.
