File:North Polar Layers of Mars.jpg
![File:North Polar Layers of Mars.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/e/ef/North_Polar_Layers_of_Mars.jpg/800px-North_Polar_Layers_of_Mars.jpg?20100806093246)
Original file (2,560 × 1,920 pixels, file size: 818 KB, MIME type: image/jpeg)
Captions
Captions
Summary
[edit]DescriptionNorth Polar Layers of Mars.jpg |
English: The north polar layered deposits are layers of dusty ice up to 3 kilometres thick and approximately 1000 kilometres in diameter. We can see the layers exposed on the walls of troughs and scarps cut into the deposits, such as the trough wall imaged here.
The bright region at the top is the flat surface above the trough wall; it is higher than the terrain underneath. The wall exposing these layers has a vertical relief of about 600 meters. Three things are immediately apparent about the layers exposed on this trough face. First, individual layers have different surface textures. Some scientists think that changing surface textures reflect changing physical properties (such as dust content or ice grain size) of the underlying layer, and looking for patterns in the sequence of layer textures can tell us about patterns in the climate in which a layer formed. Second, there are several unconformities, or places where one layer is interrupted and overlain by another layer. These unconformities are due to periods where layers were eroded or removed, followed by times when new layers were deposited. Mapping the locations of unconformities can tell us how the deposit shrank and grew over time, and tell us where large changes in climate occurred, causing water ice to be removed from the polar regions. Finally, the dark and bright streaks are due to recent winds blowing surface frost around, and can tell us about wind patterns in the current polar climate. |
Date | |
Source | HiRISE |
Author | NASA/JPL/University of Arizona |
Local Mars time: 4:28 AM. Latitude (centered): 80.7 °, Longitude (East): 42.1 °. Range to target site: 316.7 km. Original image scale range: 31.7 cm/pixel (with 1 x 1 binning) so objects ~95 cm across are resolved. Map projected scale: 25 cm/pixel. Map projection: POLAR STEREOGRAPHIC. Emission angle: 0.1 °. Phase angle: 71.1 °. Solar incidence angle: 71 °, with the Sun about 19 ° above the horizon. Solar longitude: 114.5 °, Northern Summer.
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:
|
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 09:32, 6 August 2010 | ![]() | 2,560 × 1,920 (818 KB) | Originalwana (talk | contribs) | {{Information |Description={{en|1=The north polar layered deposits are layers of dusty ice up to 3 kilometres thick and approximately 1000 kilometres in diameter. We can see the layers exposed on the walls of tro |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
_error | 0 |
---|