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File:The Galilean satellites (the four largest moons of Jupiter).tif

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This composite includes the four largest moons of Jupiter which are known as the Galilean satellites. The Galilean satellites were first seen by the Italian astronomer Galileo Galilei in 1610. Shown from left to right in order of increasing distance from Jupiter, Io is closest, followed by Europa, Ganymede, and Callisto.

The order of these satellites from the planet Jupiter helps to explain some of the visible differences among the moons. Io is subject to the strongest tidal stresses from the massive planet. These stresses generate internal heating which is released at the surface and makes Io the most volcanically active body in our solar system. Europa appears to be strongly differentiated with a rock/iron core, an ice layer at its surface, and the potential for local or global zones of water between these layers. Tectonic resurfacing brightens terrain on the less active and partially differentiated moon Ganymede. Callisto, furthest from Jupiter, appears heavily cratered at low resolutions and shows no evidence of internal activity.

North is to the top of this composite picture in which these satellites have all been scaled to a common factor of 10 kilometers (6 miles) per picture element.

The Solid State Imaging (CCD) system aboard NASA's Galileo spacecraft acquired the Io and Ganymede images in June 1996, the Europa images in September 1996, and the Callisto images in November 1997.

Launched in October 1989, the spacecraft's mission is to conduct detailed studies of the giant planet, its largest moons and the Jovian magnetic environment.
日期 在1996年到1997年之间
date QS:P,+1996-00-00T00:00:00Z/8,P1319,+1996-00-00T00:00:00Z/9,P1326,+1997-00-00T00:00:00Z/9
来源 http://photojournal.jpl.nasa.gov/catalog/PIA01299 (direct link)
作者 NASA/JPL/DLR
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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。)
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当前2011年12月29日 (四) 12:542011年12月29日 (四) 12:54版本的缩略图1,830 × 600(1.51 MB)Prof. Professorson{{Information |Description=This composite includes the four largest moons of en:Jupiter which are known as the Galilean satellites. The Galilean satellites were first seen by the Italian astronomer en:Galileo Galilei in

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