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Soubor:Craters on Ganymede.jpg
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| - | + | Fotografie + Description: | |
| + | * English: Fresh impact craters on the grooved terrain on Ganymede by Galileo. The crater to the north is Gula (38 kilometers km in diameter). It has a distinctive central peak. The crater to the south is Achelous. It is 32 km in diameter. A characteristic feature of both craters, almost identical in size, is the "pedestal" - an outward-facing, relatively gently sloped scarp that terminates the continuous ejecta blanket. Similar features may be seen in ejecta blankets of Martian craters, suggesting impacts into a volatile (ice)-rich target material. Furthermore, both craters appear crisp and feature terraces. Gula has a prominent central peak; Achelous instead may show the remnant of a collapsed central peak or a central pit that is not fully formed. On lower-resolution images taken under higher sun illumination angle, both craters are shown to have extended bright rays, especially Achelous, which demonstrates that these two craters are younger than the respective surrounding landscape. | ||
| + | * Date: 21 February 2008 | ||
| + | * Source: http://photojournal.jpl.nasa.gov/catalog/PIA01609 | ||
| + | * Author: NASA | ||
| + | |||
| + | {{PD-USGov-NASA}} | ||
Aktuální verze z 23. 7. 2019, 10:47
Fotografie + Description:
- English: Fresh impact craters on the grooved terrain on Ganymede by Galileo. The crater to the north is Gula (38 kilometers km in diameter). It has a distinctive central peak. The crater to the south is Achelous. It is 32 km in diameter. A characteristic feature of both craters, almost identical in size, is the "pedestal" - an outward-facing, relatively gently sloped scarp that terminates the continuous ejecta blanket. Similar features may be seen in ejecta blankets of Martian craters, suggesting impacts into a volatile (ice)-rich target material. Furthermore, both craters appear crisp and feature terraces. Gula has a prominent central peak; Achelous instead may show the remnant of a collapsed central peak or a central pit that is not fully formed. On lower-resolution images taken under higher sun illumination angle, both craters are shown to have extended bright rays, especially Achelous, which demonstrates that these two craters are younger than the respective surrounding landscape.
- Date: 21 February 2008
- Source: http://photojournal.jpl.nasa.gov/catalog/PIA01609
- Author: NASA
+ pochází z Wikimedia Commons, kde má status – This file is in the public domain in the United States because it was solely created by NASA.
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NASA copyright policy states that "NASA material is not protected by copyright unless noted".
(Use of NASA logos, insignia and emblems is restricted per U.S. law 14 CFR 1221)
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| současná | 1. 4. 2013, 14:49 |  | 813×753 (192 kB) | Sysop (diskuse | příspěvky) | (BUNDESA124) |
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