File:Mars Viking 21i093.png
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Mars_Viking_21i093.png (510 × 512 像素,檔案大小:340 KB,MIME 類型:image/png)
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摘要[編輯]
描述Mars Viking 21i093.png |
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. |
日期 | 2010-02-25; original photo was taken 1979-05-18. |
來源 |
Own work based on images in the NASA Viking image archive العربية: صورةٌ لسطح كوكبِ المريخ مُلتقَطة في التاسع من كانون الأول/ديسمبر عام 1977 |
作者 | "Roel van der Hoorn (Van der Hoorn)" |
授權許可 (重用此檔案) |
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. |
其他版本 | 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. |
授權條款[編輯]
Public domainPublic domainfalsefalse |
此作品已由其作者,英文維基百科的Van der Hoorn,釋出至公有領域。此授權條款在全世界均適用。 這可能在某些國家不合法,如果是的話: Van der Hoorn授予任何人有權利使用此作品於任何用途,除受法律約束外,不受任何限制。Public domainPublic domainfalsefalse |
The image is based on an original image from NASA to which the following copyright statement is applicable:
Public domainPublic domainfalsefalse |
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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日期/時間 | 縮圖 | 尺寸 | 使用者 | 備註 | |
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目前 | 2010年2月25日 (四) 00:11 | 510 × 512(340 KB) | Van der Hoorn(留言 | 貢獻) | {{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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