Editing Helene (moon) (section)

== Geology ==

Images of Helene taken by the Cassini spacecraft, with resolutions of up to 24 meters per pixel, show a landscape characterized by broad 2–10km scale depressions with interior slopes no greater than 12°.{{sfn|Hirata et al. 2014}} These basins are likely the decayed remains of old impact craters.{{sfn|Umurhan|Howard|Moore|Schenk|2015}}

Thin, elongated km-scale raised grooves trace the slopes of many of Helene's basins, likely representing [[Mass wasting|mass flow]] features and indicating that the moon is undergoing active geologic processes such as [[Mass wasting|mass-wasting]] and erosion. Digital elevation models suggest that the grooves have a positive relief of between 50 and 100 meters. Helene has more than 70 craters, while it shows a bimodal appearance—the heavily cratered trailing hemisphere exhibits a crater density ten times greater than the smooth-looking leading hemisphere.{{sfn|Hirata et al. 2014}}

Simulation models show that the time series of surface activity on Helene is chaotic.{{citation needed|date=February 2024}}