維基百科

File:Mars Viking 22e169.png

Mars_Viking_22e169.png （208 × 512 像素，檔案大小：88 KB，MIME 類型：image/png）

摘要

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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.
來源 Own work based on images in the NASA Viking image archive
作者 "Roel van der Hoorn (Van der Hoorn)"
授權許可
(重用此檔案)		 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.

授權條款

Public domain 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。

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

Public domain 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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目前2007年7月4日 (三) 17:37於 2007年7月4日 (三) 17:37 版本的縮圖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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