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SPACE-MERCURY-MESSENGER
In this image released by NASA September 29, 2009, shows a newly acquired image of Mercury by the Messenger spacecraft during its third fly-by. The unnamed crater in the center of the image, viewed at close range for the first time displays an arc-shaped depression known as a pit crater on its floor. Impact craters on Mercury that host pit craters in their interiors have been named pit-floor craters. Unlike impact craters, pit craters are rimless, often irregularly shaped, and steep-sided, and they display no associated ejecta or lava flows The image was acquired on September 29, 2009. AFP PHOTO/NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington = RESTRICTED TO EDITORIAL USE =
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Detalii fotografie |
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MERCURY, SPACE |
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AFP / Mediafax Foto |
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30 Septembrie 2009 |
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1766 x 1908 (437.46 KB) |
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