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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.
Kilde PIA01299
Forfatter Image courtesy NASA/JPL-Caltech.
Dette billede eller video er katalogiseret af Jet Propulsion Laboratory under National Aeronautics and Space Administration (NASA) ved foto ID: PIA01299.

Denne tag indeholder og/eller påviser ingen ophavsretslige informationer eller kildeinformationer af dette medie. Rettigheder skal stadigvæk oplyses. Se Commons:Licensing for flere informationer.
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Dato/tidMiniaturebilledeDimensionerBrugerKommentar
nuværende20. aug. 2018, 04:04Miniature af versionen fra 20. aug. 2018, 04:041.830 × 600 (610 KB)PlanetUserConverted from TIFF (610 KB)
28. sep. 2011, 05:56Miniature af versionen fra 28. sep. 2011, 05:561.830 × 600 (556 KB)CraigboyCropped
4. jun. 2005, 21:54Miniature af versionen fra 4. jun. 2005, 21:541.870 × 635 (576 KB)Dbenbennconverted from TIF at 100% quality
9. apr. 2005, 01:08Miniature af versionen fra 9. apr. 2005, 01:081.870 × 635 (153 KB)BricktopNASA image
21. jan. 2005, 04:15Miniature af versionen fra 21. jan. 2005, 04:15990 × 337 (52 KB)KristagaFrom en.wiki (NASA image) http://upload.wikimedia.org/wikipedia/en/6/62/Galilean_satellites.jpg

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