Geological Chronicle
Located on the lunar far side west of Aitken and adjoining the rims of Vertregt and Heaviside, Zwicky spans 126.06 kilometers across. The structure is considerably eroded, with surviving segments along its southern rim while the remainder has been almost completely eradicated.
In the midst of the interior lies the satellite crater Zwicky N, which features a polygonal outline and relatively smooth inner walls. Its floor consists of dark, lower-albedo material with a fractured surface, an arrangement informally called a turtleback crater floor that is thought to result from cooling molten material or tectonic movement.
Prior to its formal naming, the feature was designated Crater 306. In 1974, the IAU named the crater for Swiss astrophysicist Fritz Zwicky, a Caltech professor who pioneered research on supernovae and galaxy clusters.