Image of Jupiter's moon Io from , km. Target Object: Io Jupiter's moon Amalthea from , km View of Jupiter's moon Callisto from 1,, km. Juli Jupiter's Moon Callisto. Jupiter has 67 confirmed moons. The Galilean Moons: Jupiter's Four Largest Moons. Callisto: one of the Galilean. Kallisto (auch Callisto oder Jupiter IV) ist der vierte Mond des Riesenplaneten Jupiter. Sie ist der zweitgrößte der vier großen Jupitermonde und ist mit einem. Inhalte nur unter Verwendung von Lizenzbedingungen weitergeben, die mit denen dieses Lizenzvertrages identisch, vergleichbar oder kompatibel sind. Juli Quelle This picture was composed from Image: Diese Beispiele können umgangssprachliche Wörter, die auf Beste Spielothek in Zimmert finden Grundlage Ihrer Suchergebnis enthalten. NASA shuts down failing Kepler in hope of salvaging last-gasp data. Kallisto weist nach dem Saturnmond Phoebe die zweithöchste Dichte an Einschlagkratern im bekannten Sonnensystem auf. Inferior conjunction The moon is closest to the disk center of hitman blood money deutsch planet, and in front of the planet.
The ancient surface of Callisto is one of the most heavily cratered in the Solar System. The large-scale geology is relatively simple; there are no large mountains on Callisto, volcanoes or other endogenic tectonic features.
Callisto's surface can be divided into several geologically different parts: The light plains include bright impact craters like Burr and Lofn , as well as the effaced remnants of old large craters called palimpsests , [i] the central parts of multi-ring structures, and isolated patches in the cratered plains.
The bright, smooth plains constitute a small fraction of Callisto's surface and are found in the ridge and trough zones of the Valhalla and Asgard formations and as isolated spots in the cratered plains.
They were thought to be connected with endogenic activity, but the high-resolution Galileo images showed that the bright, smooth plains correlate with heavily fractured and knobby terrain and do not show any signs of resurfacing.
They are possible cryovolcanic deposits. Impact crater diameters seen range from 0. These are unusually shallow and may be a transitional landform to the multi-ring structures, as with the Lofn impact feature.
The largest impact features on Callisto's surface are multi-ring basins. They were probably created by objects that were tidally disrupted as they passed close to Jupiter prior to the impact on Callisto, or by very oblique impacts.
Dark material usually lies in the lowlands surrounding and mantling bright features and appears to be smooth. On a sub-kilometer scale the surface of Callisto is more degraded than the surfaces of other icy Galilean moons.
The non-ice remnants form debris avalanches descending from the slopes of the crater walls. The relative ages of the different surface units on Callisto can be determined from the density of impact craters on them.
The older the surface, the denser the crater population. Callisto has a very tenuous atmosphere composed of carbon dioxide. The surface pressure is estimated to be 7.
Hence, it is suspected that the atmosphere of Callisto is actually dominated by molecular oxygen in amounts 10— times greater than CO 2. Observations with the Hubble Space Telescope HST placed an upper limit on its possible concentration in the atmosphere, based on lack of detection, which is still compatible with the ionospheric measurements.
Atomic hydrogen has also been detected in Callisto's atmosphere via recent analysis of Hubble Space Telescope data. The observed brightness from the scattered sunlight in Callisto's hydrogen corona is approximately two times larger when the leading hemisphere is observed.
This asymmetry may originate from a different hydrogen abundance in both leading and trailing hemispheres. However, this hemispheric difference in Callisto's hydrogen corona brightness is likely to originate from the extinction of the signal in the Earth's geocorona , which is greater when the trailing hemisphere is observed.
The partial differentiation of Callisto inferred e. The further evolution of Callisto after accretion was determined by the balance of the radioactive heating, cooling through thermal conduction near the surface, and solid state or subsolidus convection in the interior.
It is known to develop when the temperature is sufficiently close to the melting point , due to the temperature dependence of ice viscosity.
Its presence would explain the lack of any signs of the endogenic activity on the Callistoan surface. Due to the convection process, however, very slow and partial separation and differentiation of rocks and ices inside Callisto has been proceeding on timescales of billions of years and may be continuing to this day.
The current understanding of the evolution of Callisto allows for the existence of a layer or "ocean" of liquid water in its interior.
Although Callisto is very similar in bulk properties to Ganymede , it apparently had a much simpler geological history. The surface appears to have been shaped mainly by impacts and other exogenic forces.
It is speculated that there could be life in Callisto's subsurface ocean. Like Europa and Ganymede , as well as Saturn 's moons Enceladus , Mimas , Dione and Titan , a possible subsurface ocean might be composed of salt water.
It is possible that halophiles could thrive in the ocean. The principal reasons are the lack of contact with rocky material and the lower heat flux from the interior of Callisto.
The basic ingredients for life—what we call 'pre-biotic chemistry'—are abundant in many solar system objects, such as comets, asteroids and icy moons.
Biologists believe liquid water and energy are then needed to actually support life, so it's exciting to find another place where we might have liquid water.
But, energy is another matter, and currently, Callisto's ocean is only being heated by radioactive elements, whereas Europa has tidal energy as well, from its greater proximity to Jupiter.
Based on the considerations mentioned above and on other scientific observations, it is thought that of all of Jupiter's moons, Europa has the greatest chance of supporting microbial life.
The Pioneer 10 and Pioneer 11 Jupiter encounters in the early s contributed little new information about Callisto in comparison with what was already known from Earth-based observations.
The target chosen to consider in detail was Callisto. The study proposed a possible surface base on Callisto that would produce rocket propellant for further exploration of the Solar System.
Such a base could facilitate remote exploration of Europa , or be an ideal location for a Jovian system waystation servicing spacecraft heading farther into the outer Solar System, using a gravity assist from a close flyby of Jupiter after departing Callisto.
From Wikipedia, the free encyclopedia. Second largest Galilean moon of Jupiter and third largest in the solar system.
For other uses, see Callisto. Not to be confused with Calypso moon of Saturn. Callisto was named after a nymph in Greek mythology who was a love interest of Zeus.
Zeus then placed her in the heavens as the constellation Ursa Major the big dipper. Callisto was discovered by Galileo Galilei and Simon Marius in and is one of the four Galilean satellites.
Callisto is without a doubt the most heavily cratered object in the known solar system. This suggests that the surface is very old and inactive.
The largest impact crater on Callisto is known as Valhalla. It is 2, miles 4, km in diameter. Another large crater, Asgard, has a diameter of miles 1, km.
It appears that Callisto's surface has undergone very little change since its formation over four billion years ago.
Because its surface is so geologically inactive, astronomers believe that Callisto may represent what many of the moons in the Solar System may have looked like at a much earlier stage in their development.
Composite image of the surface of Callisto showing large impact craters. The large, bright crater on the left is known as Asgard.
The white material is believed to be ice that was excavated by the impact. The 4 Galilean moons of Jupiter, using a small telescope, but a much better one than Galileo had.
A satellite is something that orbits around a body in space. Of these satellites, or moons, there are about 16 large ones. The four largest are known as the Galilean moons because they were first seen and described by the great Italian scientist Galileo in They were later named Io , Europa , Ganymede and Callisto.Die Sonde Galileo hatte bei ihren Vorbeiflügen ein schwaches Magnetfeld bei Kallisto gemessen, dessen Stärke variiert, während sich der Mond durch die extrem starke Magnetosphäre des Jupiter bewegt. Juli Quelle This picture was composed from Image: Bitte beachten Sie, dass die hier gezeigten , extremen Bedingungen nicht den Bedienungsempfehlungen entsprechen und ein solcher Gebrauch von der Garantie nicht abgedeckt ist. You can find out about to current position of the moons with help of the moon position charts, included in the following table. The JUICE mission focuses on Ganymede and Callisto, along with two Europa flybys, and therefore stays outside of Jupiter's main radiation belts for most of the mission operations. Namensnennung — Du musst angemessene Urheber- und Rechteangaben machen, einen Link zur Lizenz beifügen und angeben, ob Änderungen vorgenommen wurden. Diese sind nicht gemeinfrei. Als Voraussetzung für die Durchführung der Mission nennt die Studie eine intensive Erkundung durch unbemannte Sonden ab etwa Monde der Planeten und Zwergplaneten. Anders als der Erdmond verfügt Kallisto wie alle Trabanten im Sonnensystem über kein offizielles Astronomisches Symbol oder eines, das allgemein verwendet wird. Einfaltspinseln der Polizei klar. The extreme environments of our own world are alien vistas. Hypervelocity alien stars could be invading the Milky Way. Diese Seite wurde zuletzt am Im Extremfall kann diese Konkurrenz die Form von Bürgerkriegen annehmen.