Image:Hrp221b.jpg

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Size of this preview: 421 × 599 pixel
Image in higher resolution (469 × 667 pixel, 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:

NASA logos (which include the current "meatball" logo, the old "worm" logo, and the seal) are copyrighted.
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]

File history

Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version.
Click on date to download the file or see the image uploaded on that date.

(del) (cur) 16:48, 7 October 2005 . . RJHall (Talk | contribs) . . 469×667 (79,389 bytes) (Reduced in size by 33%)
(del) (rev) 16:34, 7 October 2005 . . RJHall (Talk | contribs) . . 700×995 (106,171 bytes) (Zwicky N)