File:Darkness Descending (PIA18332).jpg
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Summary
[edit]DescriptionDarkness Descending (PIA18332).jpg |
English: Saturn's unusual appearance in this picture is a result of the planet being imaged via an infrared filter.
Infrared images can help scientists determine the location of clouds in the planet's atmosphere. In this image, Cassini's wide-angle camera used a filter which is especially sensitive to infrared wavelengths that are absorbed by methane. Methane is not a major component of Saturn's atmosphere, but enough of it is present to make a difference in how much light is reflected by different clouds. The darker areas reveal clouds that are lower in the atmosphere, therefore under more methane. Bright areas on Saturn are higher altitude clouds. Scientists think that these lower-altitude clouds are in regions where "air" is descending while the higher-altitude clouds are in regions where air is rising. Thus, images like this one can help us map the vertical air movements on Saturn. This view looks toward the unilluminated side of the rings from less than one degree from the ring plane. The image was taken with the Cassini spacecraft wide-angle camera on May 25, 2015 using a spectral filter which preferentially admits wavelengths of near-infrared light centered at 890 nanometers. The view was acquired at a distance of approximately 930,000 miles (1.5 million kilometers) from Saturn and at a Sun-Saturn-spacecraft, or phase, angle of 99 degrees. Image scale is 55 miles (89 kilometers) per pixel. |
Date | |
Source | http://photojournal.jpl.nasa.gov/catalog/PIA18332 |
Author | NASA/JPL-Caltech/Space Science Institute |
Licensing
[edit]Public domainPublic domainfalsefalse |
This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.) | ||
Warnings:
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This image or video was catalogued by Jet Propulsion Laboratory of the United States National Aeronautics and Space Administration (NASA) under Photo ID: PIA18332. This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing. Other languages:
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current | 11:48, 11 August 2015 | 1,041 × 1,041 (120 KB) | Nonexyst (talk | contribs) | User created page with UploadWizard |
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Orientation | Normal |
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Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Adobe Photoshop CS3 Windows |
File change date and time | 12:27, 9 August 2015 |
Color space | Uncalibrated |
Image width | 1,041 px |
Image height | 1,041 px |
Date and time of digitizing | 05:27, 9 August 2015 |
Date metadata was last modified | 05:27, 9 August 2015 |
IIM version | 6,294 |