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The Galilean moons of Jupiter. From left, they are Io, Europa, Ganymede, and Callisto.

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. The Jet Propulsion Laboratory, Pasadena, CA, manages the mission for NASA's Office of Space Science, Washington, DC.
Fonti PIA01299
Auturi Image courtesy NASA/JPL-Caltech.
Sta mmàggini o filmatu fu catalugatu dô
Jet Propulsion Lab
National Aeronautics and Space Administration
(NASA) dê Stati Uniti dâ Mèricacô Photo ID: PIA01299.

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Public domain Stu file è ntô duminiu pùbblicu pirchì criatu dâ NASA. La pulìtica supra lu copyright dâ NASA afferma ca «lu matiriali dâ NASA nun è prutiggiutu di copyright a menu ca nun sia spicificatu autrimenti». (NASA copyright policy e JPL Image Use Policy).
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Data/UraMiniaturaDiminsioniUtentiOggettu
currenti04:04, 20 aus 2018Miniatura di la virsioni dû 04:04, 20 aus 20181 830 × 600 (610 KB)PlanetUserConverted from TIFF (610 KB)
05:56, 28 sit 2011Miniatura di la virsioni dû 05:56, 28 sit 20111 830 × 600 (556 KB)CraigboyCropped
21:54, 4 giu 2005Miniatura di la virsioni dû 21:54, 4 giu 20051 870 × 635 (576 KB)Dbenbennconverted from TIF at 100% quality
01:08, 9 apr 2005Miniatura di la virsioni dû 01:08, 9 apr 20051 870 × 635 (153 KB)BricktopNASA image
04:15, 21 jin 2005Miniatura di la virsioni dû 04:15, 21 jin 2005990 × 337 (52 KB)KristagaFrom en.wiki (NASA image) http://upload.wikimedia.org/wikipedia/en/6/62/Galilean_satellites.jpg

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