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File:Callisto terrain.jpg

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這個檔案來自維基共享資源
維基百科，自由的百科全書

原始檔案 （800 × 799 像素，檔案大小：185 KB，MIME 類型：image/jpeg）

描述
  • Textured Terrain in Callisto's Asgard Basin
  • original image caption: This fascinating region of Jupiter's icy moon, Callisto, shows the transition from the inner part of an enormous impact basin, Asgard, to the outer "surrounding plains." Small, bright, fine textured, closely spaced bumps appear throughout the inner part of the basin (top of image) and create a more fine textured appearance than that seen on many of the other inter-crater plains on Callisto. At low resolution, these icy bumps make Asgard's center brighter than the surrounding terrain. What caused the bumps to form is still unknown, but they are associated clearly with the impact that formed Asgard. The ridge that cuts diagonally across the lower left corner is one of many giant concentric rings that extend for hundreds of kilometers outside Asgard's center. Exterior to the ring (lower left corner), Callisto's surface changes significantly. Still peppered with craters, the number of icy bumps decreases while their average size increases. The fine texture is not as visible in the middle of the image. One explanation is that material from raised features (such as the ridge) may slide down slope and cover small scale features. Such images of Callisto help us understand the dynamics of giant impacts into icy surfaces, and how the large structures change with time. North is to the top of the picture. The image, centered at 27.1 degrees north latitude and 142.3 degrees west longitude, covers an area approximately 80 kilometers (50 miles) by 90 kilometers (55 miles). The resolution is about 90 meters (295 feet) per picture element. The image was taken on September 17th, 1997 at a range of 9200 kilometers (5700 miles) by the Solid State Imaging (SSI) system on NASA's Galileo spacecraft during its tenth orbit of Jupiter.
日期
來源 http://photojournal.jpl.nasa.gov/catalog/PIA01629
作者 NASA
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Public domain 本作品由NASA創作，屬於公有領域。根據NASA的版權政策：“NASA的創作除非另有聲明否則不受版權保護。”（參見：Template:PD-USGov/zh，NASA版權政策或JPL圖像使用政策）
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本圖像或影音收錄於美國國家航空暨太空總署 （NASA）噴射推進實驗室（Jet Propulsion Laboratory），其照片編號為： PIA01629

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Old file history

History on English Wikipedia: 22:12, 17 March 2005 . . The Singing Badger (Talk | contribs | block) . . 800x799 (189,114 bytes) (Closeup of Callisto's landscape. {PD-USGov-NASA})

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目前2005年4月1日 (五) 06:18於 2005年4月1日 (五) 06:18 版本的縮圖800 × 799（185 KB）Smartech~commonswiki{{PD-USGov-NASA}} Made by Galileo Spacecraft, downloaded from NASA website. In public domain

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