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File:Titan S. polar lake changes 2004-5.jpg

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English: These mosaics of the south pole of Saturn’s moon Titan, made from images taken almost one year apart, show changes in dark areas that may be lakes filled by seasonal rains of liquid hydrocarbons.

The image on the left was acquired July 3, 2004. That on the right was taken June 6, 2005. In the 2005 image, new dark areas are visible and have been circled in the labeled version. The very bright features are clouds in the lower atmosphere (the troposphere). Titan's clouds behave similarly to those on Earth, changing rapidly on timescales of hours and appearing in different places from day to day. During the year that elapsed between these two observations, clouds were frequently observed at Titan's south pole by observers on Earth and by Cassini’s imaging science subsystem (see PIA06124).

It is likely that rain from a large storm created the new dark areas that were observed in June 2005. Some features, such as Ontario Lacus, show differences in brightness between the two observations that are the result of differences in illumination between the two observations. These mosaics use images taken in infrared light at a wavelength of 938 nanometers. The images have been oriented with the south pole in the center (black cross) and the 0 degree meridian toward the top. Image resolutions are several kilometers (several miles).

The original NASA image has been cropped to remove the versions of the images without labels.
日期
来源 http://ciclops.org/view/5458/Changes_in_Titans_Lakes
作者 NASA/JPL/Space Science Institute
其他版本 http://photojournal.jpl.nasa.gov/catalog/PIA11147


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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/zhNASA版权方针页面JPL图片使用方针。)
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当前2010年8月7日 (六) 21:532010年8月7日 (六) 21:53版本的缩略图1,950 × 958(289 KB)LobStoRprogressive jpeg
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