File:Mars Viking 22e169.png

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Mars_Viking_22e169.png ‎（208 × 512像素，文件大小：88 KB，MIME类型：image/png）

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Original Caption Released with NASA Image:

Photo from Viking Lander 2 shows late-winter frost on the ground on Mars around the lander. The view is southeast over the top of Lander 2, and shows patches of frost around dark rocks. The surface is reddish-brown; the dark rocks vary in size from 10 centimeters (four inches) to 76 centimeters (30 inches) in diameter. This picture was obtained September 25, 1977. The frost deposits were detected for the first time 12 Martian days (sols) earlier in a black-and-white image. Color differences between the white frost and the reddish soil confirm that we are observing frost. The Lander Imaging Team is trying to determine if frost deposits routinely form due to cold night temperatures, then disappear during the warmer daytime. Preliminary analysis, however, indicates the frost was on the ground for some time and is disappearing over many days. That suggests to scientists that the frost is not frozen carbon dioxide (dry ice) but is more likely a carbon dioxide clathrate (six parts water to one part carbon dioxide). Detailed studies of the frost formation and disappearance, in conjunction with temperature measurements from the lander’s meteorology experiment, should be able to confirm or deny that hypothesis, scientists say.
日期 2007-07-02; original photo was taken 1977-09-25.
来源 Own work based on images in the NASA Viking image archive
作者 "Roel van der Hoorn (Van der Hoorn)"
授权
(二次使用本文件)		 I used the original 22e169.blu, 22e169.grn and 22e169.red images from the NASA Viking image archive, converted them to .png, manually removed the noise, merged them into one image and finally increased the brightness and contrast with 20. Except for the conversion, this was all done in Adobe Photoshop CS2. 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 the Viking2-PIA00573.jpg. This file was 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 本作品已被作者英语维基百科的Van der Hoorn释出到公有领域。这适用于全世界。
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Van der Hoorn无条件地授予任何人以任何目的使用本作品的权利，除非这些条件是法律规定所必需的。

The image is based on original images from NASA to which the following copyright statement is applicable:

Public domain 本文件完全由NASA创作，在美国属于公有领域。根据NASA的版权方针，NASA的材料除非另有声明否则不受版权保护。（参见Template:PD-USGov/zh、NASA版权方针页面或JPL图片使用方针。）
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当前2007年7月4日 (三) 17:372007年7月4日 (三) 17:37版本的缩略图208 × 512（88 KB）Van der Hoorn{{Information |Description = Original Caption Released with Image: Photo from Viking Lander 2 shows late-winter frost on the ground on Mars around the lander. The view is southeast over the top of Lander 2, and shows patches of frost around dark rocks. Th

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