"A panoramic camera view of an unusual crater on the lunar far side, west of the large crater Aitken. The crater is polygonal in outline, its rim is not raised, and its walls are relatively smooth. The floor of the crater is occupied by a rather dark material with numerous cracks. This pattern has been informally referred to as a turtleback crater floor (El-Baz and Roosa, 1972). It occurs only in a few craters on the lunar surface and is probably caused by the cooling of a molten or partially molten fill within the crater. However, cracking due to tectonic movement (for example, the upward thrust of a central plug) cannot be excluded."—NASA SP-362, Page 221, Figure 236.
The crater Zwicky was apparently named at a date following the release of this photograph.
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JPEG file comment
This is a virtual print of Apollo Photograph AS17-P-1931 generated by the School of Earth and Space Exploration, Arizona State University. Usage of this image is governed by the Acceptable Use Policy, which can be accessed at http://apollo.sese.asu.edu/ABOUT_SCANS/index.html