File:Gibran pit crater arrow.jpg

原始文件(847 × 1,215像素,文件大小:225 KB,MIME类型:image/jpeg


摘要

描述
English: Date Acquired: January 14, 2008

Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS) Resolution: 510 meters/pixel (0.32 miles/pixel) Scale: The central impact crater Gibran, with a pit crater on its floor, is 102 kilometers (63 miles) in diameter. Location: 35.5°N, 249.1°E Projection: This image is an orthographic reprojection created from NAC images taken as MESSENGER approached Mercury during its first flyby.

Of Interest: The newly named crater Gibran, located at the center of this image, contains a large, nearly circular pit crater, identified with the white arrow. Multiple examples of pit craters have been observed on Mercury on the floors of impact craters, leading to the name pit-floor craters for the impact structures that host these features. Unlike impact craters, pit craters are rimless, often irregularly shaped, steep-sided, and display no associated ejecta or lava flows. These pit craters are thought to be evidence of shallow volcanic activity and may have formed when retreating magma caused an unsupported area of the surface to collapse, creating a pit. Pit-floor craters may provide an indication of internal igneous processes where other evidence of volcanic processes is absent or ambiguous. The discovery of multiple pit-floor craters augments a growing body of evidence that volcanic activity has been a widespread process in the geologic evolution of Mercury's crust.
日期
来源 http://messenger.jhuapl.edu/gallery/sciencePhotos/image.php?gallery_id=2&image_id=317
作者 NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington

许可协议

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。)
警告:

说明

添加一行文字以描述该文件所表现的内容

此文件中描述的项目

描绘内容

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2009年8月1日 (六) 16:412009年8月1日 (六) 16:41版本的缩略图847 × 1,215(225 KB)Bryan Derksen{{Information |Description={{en|1=Date Acquired: January 14, 2008 Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS) Resolution: 510 meters/pixel (0.32 miles/pixel) Scale: The central impact crater Gibran, with a pit crater on

以下页面使用本文件:

全域文件用途

以下其他wiki使用此文件:

元数据