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File:Mars Viking 21i093.png

Mars_Viking_21i093.png (510 × 512 pixel, dimensione del file: 340 KB, tipo MIME: image/png)

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Descrizione
English: This false color photo of the surface of Mars was taken by Viking Lander 2 at its Utopia Planitia landing site on May 18, 1979, and relayed to Earth by Orbiter 1 on June 7. It shows a thin coating of water ice on the rocks and soil. The time the frost appeared corresponds almost exactly with the buildup of frost one Martian year (23 Earth months) ago. Then it remained on the surface for about 100 days. Scientists believe dust particles in the atmosphere pick up bits of solid water. That combination is not heavy enough to settle to the ground. But carbon dioxide, which makes up 95 percent of the Martian atmosphere, freezes and adheres to the particles and they become heavy enough to sink. Warmed by the Sun, the surface evaporates the carbon dioxide and returns it to the atmosphere, leaving behind the water and dust. The ice seen in this picture, like that which formed one Martian year ago, is extremely thin, perhaps no more than one-thousandth of an centimeter thick. The view is looking towards the south southeast, the long boulder to the right is roughly one meter across.
Data 2010-02-25; original photo was taken 1979-05-18.
Fonte

Own work based on images in the NASA Viking image archive
See accurate colors at: PIA00571: Ice on Mars Utopia Planitia Again

العربية: صورةٌ لسطح كوكبِ المريخ مُلتقَطة في التاسع من كانون الأول/ديسمبر عام 1977
Autore "Roel van der Hoorn (Van der Hoorn)"
Licenza
(Riusare questo file)		 I used the original 21i093.blu, 21i093.grn and 21i093.red images from the NASA Viking image archive, converted them to .png, manually removed the noise and finally merged them into one image (almost matching true color; see here for the channel mixing process). Except for the conversion, this was all done in Adobe Photoshop CS2 and Adobe Photoshop CS4. The original files by NASA are in the public domain, and so is this new one.
Altre versioni I created this image as a replacement for File:Ice on Mars Utopia Planitia (PIA00571).jpg and File:Viking2 frost enhance.jpg. These files were created by NASA, but the quality is not very high. Using the original pictures from the Lander archive resulted in a higher quality image.

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Public domain Quest'opera è stata rilasciata nel pubblico dominio dal suo autore, Van der Hoorn di Wikipedia in inglese. Questa norma si applica in tutto il mondo.
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The image is based on an original image from NASA to which the following copyright statement is applicable:

Public domain Questo file è nel pubblico dominio perché creato dalla NASA. La politica sul copyright della NASA afferma che «il materiale della NASA non è protetto da copyright a meno che non sia specificato altrimenti». (NASA copyright policy e JPL Image Use Policy).
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attuale01:11, 25 feb 2010Miniatura della versione delle 01:11, 25 feb 2010510 × 512 (340 KB)Van der Hoorn{{Information |Description={{en|1=Original Caption Released with NASA Image:<br /> This color image shows a thin layer of water ice frost on the martian surface at Utopia Planitia. It was taken by Viking 2 Lander camera 2 on 18 May 1979, almost exactly on

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