[EN VIDÉO] Saturn: the giant with rings of ice and dustEmbark on a journey to meet the second largest planet in the solar system: Saturn. A gas giant is surrounded by a large number of shiny rings that do not leave anyone indifferent when observed. Learn about the world of Saturn, which has been closely explored for 13 years by the Cassini probe.
It’s up to the astronomer, mathematician and physical Dutch Christian Higgins (1629-1695) that we owe the discovery of Saturn’s rings in 1655. To tell the truth, they have been well observed in astronomical telescopes ever since Galileo But no one until Huygens had clear observations highlighting their nature and it was also he who derived from his interpretation of the existence of rings around Saturn a verifiable prediction that convinces his colleagues: the observation at the edge of these rings in 1671.
Until the 1970s, only Saturn’s rings were known, but in 1979 the Voyager 1 probe revealed rings Jupiter. In 1989, the probe Voyager 2 It will make it possible to film episodes Neptune whose existence was proven in 1984 thanks to the monitoring programhide Fromstars suggest it Andre Braich and colleagues, Bruno Siccardi and Françoise Roques at Paris Meudon Observatory, and produced by Patrice Bouchet, Reinhold Hafner and Jean Manfreud at La Silla Observatory (ESO).
In fact, it rings aroundUranus It was actually discovered by chance on March 10, 1977 by James L. Elliott, Edward W. Dunham and Douglas J. Mink from observations made with Gerard P. Kuiper Airborne Observatory (KAO; in French “Gerard P. Kuiper Airborne Observatory”) which was a project of NASA To develop research in astronomy Infrared.
Jovian tension rings are constantly fed with dust
But back to the rings of Jupiter. Unlike Saturn’s, the Jovian ring system is weak and composed mostly of dust rather than ice, and these reasons explain why it took so long to discover it. It is divided into several episodes: the aura, the main episode, and the Gossamer episodes. In particular, it has been studied using telescope Hubble and sensors Galileo And the Juno.
We do not yet know the origin of Saturn’s rings, nor when they are dated. This is an open topicAnalogously, we wondered why Jupiter doesn’t have a similar ring system, which is slightly larger than Saturn and larger than Saturn. who are they Astronomy scientists From the University of California, Riverside, USA arXiv An article in which they propose an answer to this riddle.
In a statement from the university, one of the authors of the article said, Stephen KingExplain that who – which [l]We were so upset that Jupiter doesn’t have the most amazing rings that would put Saturn in such a disgrace. If Jupiter had it, it would appear much brighter to us, because the planet is much closer to Saturn. This prompted the researcher to wonder if Jupiter had rings in the past, rings that would have disappeared due to the instability of celestial mechanics with gravitational disturbances, tidal forces so is echo gravity.
The Computers Modern improvements and simulations of consequences of lawsAstrophysics That they let it so was exploited by Stephen Kane and doctoral student Zixing Li to find out for sure. Therefore, the two men sought the effects made by the four moons Jupiter Principles, IoEurope , Ganymede And the Callisto On rings around the buyer.
The results weren’t long in coming, as Kane again explained in a press release: We discovered that there are Galilean moons of Jupiter, one of which is our largest moon solar systemIt will quickly destroy any large rings that may form “.
For this reason, the rings of Jupiter that we know about are not very massive, and it is believed that they are regularly supplied with dust by micrometeorite impacts on other smaller moons of Jupiter, such as Thebes, Amalthea and especially Adrastea and Metis.
JupiterThe color mosaic consists of 27 images taken from nine locations (in red, green and blue) by the Cassini-Huygens probe on December 29, 2000, when it was 10 million kilometers from Jupiter. This is the best image of Jupiter ever, which allows you to view the details, the smallest being 60 km.
The Shoemaker-Levy Effect on JupiterThe photo was taken in July 1994, right after the impact.
IU and Cassini Jupiter
Jupiter and its system
breakout on ioIncredible photos of the eruption of the Io volcano in the Tvshtar region
europe ice pack 1
Europe ice pack 2
Outbreak on Ayo: Tvshtar DistrictLava fountains in the caldera in the Tvshtar region.
Snow slopes in Europe
Europe Structure Models
Volcanic plumes on Io
Evolution of volcanic plumes on Io
Evolution of the Earth on Io
Important volcanic areas on Io
Comparison of the major satellites of Jupiter (surfaces)
Comparison of the major satellites of Jupiter
Comparison between Io and AmaltheIn this image we compare the size of two moons of Jupiter. Note the similarity in color which probably means that Amalthe owes its color to plumes of sulfur ejected by Io.
Lava fountains on Io
Tvshtar volcanic area
Recently drowned on IoThe image shows, in the dark, a recent flow of Io, covering an ancient (?) deposit area. For more: http://photojournal.jpl.nasa.gov/catalog/PIA02557
Sodium clouds surrounding IoThis image, taken with filters, shows the gaseous atmosphere of sodium and sulfur from eruptions on Io. For more information: http://photojournal.jpl.nasa.gov/catalog/PIA01111
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