File:PIA17470 Titan northern hemisphere.jpg
![File:PIA17470 Titan northern hemisphere.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/5/5d/PIA17470_Titan_northern_hemisphere.jpg/795px-PIA17470_Titan_northern_hemisphere.jpg?20131026043140)
原始文件 (2,120 × 1,600像素,文件大小:1.02 MB,MIME类型:image/jpeg)
说明
说明
摘要
[编辑]描述PIA17470 Titan northern hemisphere.jpg |
English: This false-color mosaic, made from infrared data collected by NASA's Cassini spacecraft, reveals the differences in the composition of surface materials around hydrocarbon lakes at Titan, Saturn's largest moon. Titan is the only other place in the solar system that we know has stable liquid on its surface, though its lakes are made of liquid ethane and methane rather than liquid water. While there is one large lake and a few smaller ones near Titan's south pole, almost all of Titan's lakes appear near the moon's north pole.
Scientists mapped near-infrared colors onto the visible color spectrum. Red in this image was assigned a wavelength of 5 microns (10 times longer than visible light), green 2.0 microns (four times longer than visible light), and blue 1.3 microns (2.6 times longer than visible light). The orange areas are thought to be evaporite -- the Titan equivalent of salt flats on Earth. The evaporated material is thought to be organic chemicals originally from Titan's haze particles that once dissolved in liquid methane. They appear orange in this image against the greenish backdrop of Titan's typical bedrock of water ice. In this mosaic, Kraken Mare, which is Titan's largest sea and covers about the same area as Earth's Caspian Sea and Lake Superior combined, can be seen spreading out with many tendrils on the upper right,. The big dark zone up and left of Kraken is Ligeia Mare, the second largest sea. Below Ligeia, shaped similar to a sports fan's foam finger that points just up from left, is Punga Mare, the third Titan Sea. Numerous other smaller lakes dot the area. Titan's north pole is located in the geographic location just above the end of the "finger" of Punga Mare. An annotated version of this image, with a high-resolution strip highlighted, is also available. In this version, the north pole is marked with a red cross and other smaller lakes are also labeled. The data shown here were obtained by Cassini's visual and infrared mapping spectrometer during a close flyby of Titan on Sept. 12, 2013. Until now, the spectrometer has only been able to capture distant, oblique or partial views of this area until now. The Sept. 12, 2013 flyby provided better viewing geometry. And sunlight has begun to pierce the winter darkness that shrouded Titan's north pole at Cassini's arrival in the Saturn system nine years ago. A thick cap of haze that once hung over the north pole has also dissipated as northern summer approaches. And, thankfully, Titan's beautiful, almost cloudless, rain-free weather continued during this flyby. The resolution varies across this composite view depending on when each cube of data was acquired, but the best surface sampling is 2 miles (3 kilometers) per pixel. Views of this area by other Cassini instruments include PIA17471, PIA17472, PIA17473 and PIA14584 from the imaging science subsystem; and PIA10008 and PIA17031 from the radar mapper. An earlier VIMS view can be seen at PIA16845. 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 Cassini-Huygens mission for NASA\'s Science Mission Directorate, Washington, D.C. The imaging team consists of scientists from the US, England, France, and Germany. The visual and infrared mapping spectrometer team is based at the University of Arizona. The imaging operations center and team lead (Dr. C. Porco) are based at the Space Science Institute in Boulder, Colo. For more information about the Cassini-Huygens mission, visit http://saturn.jpl.nasa.gov and the Cassini imaging team home page, http://ciclops.org. The original NASA image has been cropped, and borders were added. Some of the features in this image have been annotated in Wikimedia Commons. |
日期 | |
来源 | http://www.ciclops.org/view/7733/Titans-Northern-Lakes-Salt-Flats |
作者 | NASA / JPL-Caltech / Space Science Institute |
许可协议
[编辑]Public domainPublic domainfalsefalse |
![]() |
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/zh、NASA版权方针页面或JPL图片使用方针。) | ![]() |
![]() |
警告:
|
注解 InfoField | 该图片含有注解:在维基媒体共享资源上查看注解 |
Kivu Lacus
Sparrow Lacus
Koitere Lacus
Mayda Insula
Waikare Lacus
Mývatn Lacus
文件历史
点击某个日期/时间查看对应时刻的文件。
日期/时间 | 缩略图 | 大小 | 用户 | 备注 | |
---|---|---|---|---|---|
当前 | 2013年10月26日 (六) 04:31 | ![]() | 2,120 × 1,600(1.02 MB) | WolfmanSF(留言 | 贡献) | User created page with UploadWizard |
您不可以覆盖此文件。
文件用途
全域文件用途
以下其他wiki使用此文件:
- ar.wikipedia.org上的用途
- bn.wikipedia.org上的用途
- en.wikipedia.org上的用途
- fa.wikipedia.org上的用途
- id.wikipedia.org上的用途
- it.wikipedia.org上的用途
- pl.wikipedia.org上的用途
- ta.wikipedia.org上的用途
- zh.wikipedia.org上的用途
元数据
此文件含有额外信息,这些信息可能是创建或数字化该文件时使用的数码相机或扫描仪所添加的。如果文件已从其原始状态修改,某些详细信息可能无法完全反映修改后的文件。
方向 | 正常 |
---|---|
水平分辨率 | 72 dpi |
垂直分辨率 | 72 dpi |
使用软件 | Adobe Photoshop Elements 9.0 Windows |
文件修改日期时间 | 2013年10月25日 (五) 21:18 |
色彩空间 | sRGB |
图像宽度 | 2,120 px |
图像高度 | 1,600 px |
数字化日期时间 | 2013年10月25日 (五) 20:14 |
元数据最后修改日期 | 2013年10月25日 (五) 14:18 |
原始文件唯一ID | xmp.did:08BDF193F43DE311AA40D10252EEB0F1 |