DescriptionThe Galilean satellites (the four largest moons of Jupiter).tif
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.
Date
between 1996 and 1997
date QS:P,+1996-00-00T00:00:00Z/8,P1319,+1996-00-00T00:00:00Z/9,P1326,+1997-00-00T00:00:00Z/9
The NASA website hosts a large number of images from the
Soviet/
Russian space agency, and other non-American space agencies. These are not necessarily in the public domain.
The
SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use.
[2]
{{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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