File:PIA08409 North Polar Region of Enceladus.jpg
Original file (3,000 × 1,500 pixels, file size: 1.11 MB, MIME type: image/jpeg)
Captions
Summary
[edit]DescriptionPIA08409 North Polar Region of Enceladus.jpg |
This three-image mosaic is the highest resolution view yet obtained of Enceladus' north polar region. The view looks southward over cratered plains from high above the north pole of Enceladus. Cassini's March 2008 flyby of Enceladus was designed to directly investigate the ongoing plume activity at the moon's south pole, but the path of the spacecraft allowed investigation of older evidence for internal activity near the north pole. Compared to much of the moon's southern hemisphere—the south polar region in particular—the north polar region is much older and covered with craters. These craters are captured at different stages of disruption and alteration by tectonic activity and probably past heating from below. Many of the craters seen here are sliced by small parallel cracks that seem to be ubiquitous throughout the old cratered terrains on Enceladus. The mosaic also shows a variety of impact crater shapes, some with bowed-up floors and smaller craters within, very likely indicating that the icy crust in this area was at some time warmer than at present. While this conclusion was previously reached from NASA Voyager spacecraft images, these new data provide a much more detailed look at the fractures that modify the surface. This data will give a significantly improved comparison of the geologic history at the satellite's north pole with that at the south pole. Two prominent craters in this view, Ali Baba and Aladdin (the two overlapping craters near center), are among the largest craters known on Enceladus. Several areas of much younger terrain are visible in this mosaic, including Samarkand Sulci, an area of disrupted terrain that runs north-south at left of center, and the "leading hemisphere terrain," a region, seen at right, filled with tectonic fractures, ridges and "ridged terrain." Samarkand Sulci slices through some prominent craters that were seen in Voyager images. At that time, it was thought that the portions of the craters that extend into Samarkand were completely destroyed by whatever process formed Samarkand. However, Cassini images show remnants of the crater rims that have survived. This new insight provides a benchmark for measuring how tectonic processes modify older terrains, and will also help imaging scientists develop a more accurate timeline for the geologic history of these terrains. Lit terrain seen here is on the Saturn-facing hemisphere of Enceladus (505 kilometers, or 314 miles across). The image was taken in visible light with the Cassini spacecraft narrow-angle camera on March 12, 2008. The view was acquired at a distance of approximately 32,000 kilometers (20,000 miles) from Enceladus and at a Sun-Enceladus-spacecraft, or phase, angle of 115 degrees. Image scale is 176 meters (577 feet) per pixel. The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colo. For more information about the Cassini-Huygens mission visit http://saturn.jpl.nasa.gov/home/index.cfm. The Cassini imaging team homepage is at http://ciclops.org. The original NASA image has been modified by cropping and conversion from TIFF to JPEG format. |
||
Date | |||
Source |
http://photojournal.jpl.nasa.gov/catalog/PIA08409
|
||
Author | NASA/JPL/Space Science Institute | ||
Other versions | http://commons.wikimedia.org/wiki/Image:PIA08409.jpg (not cropped) |
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 | 19:54, 23 November 2017 | 3,000 × 1,500 (1.11 MB) | WolfmanSF (talk | contribs) | Recrop and convert from TIFF with less compression | |
07:56, 15 March 2008 | 2,912 × 2,184 (836 KB) | WolfmanSF (talk | contribs) | {{Information |Description=This three-image mosaic is the highest resolution view yet obtained of Enceladus' north polar region. The view looks southward over cratered plains from high above the north pole of Enceladus. Cassini's March 2008 flyby of Ence |
You cannot overwrite this file.
File usage on Commons
The following 5 pages use this file:
File usage on other wikis
The following other wikis use this file:
- Usage on af.wikipedia.org
- Usage on ar.wikipedia.org
- Usage on ba.wikipedia.org
- Usage on en.wikipedia.org
- Usage on en.wikibooks.org
- Usage on fa.wikipedia.org
- Usage on gl.wikipedia.org
- Usage on ja.wikipedia.org
- Usage on ko.wikipedia.org
- Usage on lt.wikipedia.org
- Usage on lv.wikipedia.org
- Usage on ml.wikipedia.org
- Usage on mn.wikipedia.org
- Usage on mwl.wikipedia.org
- Usage on no.wikipedia.org
- Usage on pnb.wikipedia.org
- Usage on ro.wikipedia.org
- Usage on ru.wikipedia.org
- Usage on sk.wikipedia.org
- Usage on ta.wikipedia.org
- Usage on tr.wikipedia.org
- Usage on uk.wikipedia.org
- Usage on vi.wikipedia.org
- Usage on zh.wikipedia.org
View more global usage of 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.
Image title | converted PNM file |
---|---|
Width | 3,380 px |
Height | 2,211 px |
Compression scheme | Uncompressed |
Pixel composition | Black and white (Black is 0) |
Orientation | Normal |
Number of components | 1 |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Data arrangement | chunky format |
Software used | Adobe Photoshop Elements 14.0 (Macintosh) |
File change date and time | 11:52, 23 November 2017 |
Color space | Uncalibrated |
Date and time of digitizing | 03:44, 23 November 2017 |
Date metadata was last modified | 03:52, 23 November 2017 |
Unique ID of original document | xmp.did:751f7e17-fe01-4fcb-b081-d28be8ec23e5 |