Image:Hrp221b.jpg

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Full resolution‎ (469 × 667 pixels, file size: 78 KB, MIME type: image/jpeg)

[edit] Summary

• Description: NASA photo of Zwicky N, an unusual crater that lies within the interior of the larger Zwicky crater. The description of the photography reads[1],

"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.

• Size: 469 × 667 pixels (reduced in size to 67% of original)
• Source: http://www.hq.nasa.gov/office/pao/History/SP-362/hrp221b.jpg

[edit] Licensing

This file is in the public domain because it was created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (NASA copyright policy page or JPL Image Use Policy) Warnings: Use of NASA logos, insignia and emblems are restricted per US law 14 CFR 1221. The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not in the public domain. Materials from the Hubble Space Telescope may be copyrighted if they do not explicitly come from the STScI. [2] All materials created by the SOHO probe are copyrighted and require permission for commercial non-educational use. [3] Images featured on the Astronomy Picture of the Day (APOD) web site may be copyrighted. [4]

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