In France, the equivalent period to middle school is collège, which lasts four years from the Sixième (“sixth,” the equivalent of the Canadian and American Grade 6) to the Troisième (“third,” the equivalent of the Canadian and American Grade 9), accommodating pupils aged between 11 and 15. Upon completion of the latter, students are awarded a Brevet des collèges if they obtain a certain number of points on a series of tests in various subjects (French, history/ geography, mathematics, science/physics/chemistry), but also on a series of skills completed during the last year and on oral examinations (e. g. about cross-subjects themes they work on the latest years, the fourth year of collège). They can then enter high school (called lycée), which lasts three years from the Seconde to the Terminale until the baccalauréat, and during which they can choose a general or a professional field of study.
However, Dr. Thomas explained to the press in May 2013 that the ring arcs are much more tenuous than the fully formed rings of Saturn. As a matter of fact, the ring arcs are so delicate and thin that it would take about ten billion years for just 1 meter of blowing icy snow to collect within the craters of Methone.
The existence of such powerful roaring winds kicking up violent and powerful dust storms suggests that the underlying sand can be set in motion, too, and that the giant dunes covering Titan's equatorial regions are still active and continually changing.
Most of the moons of our Sun's family circle the quartet of large gaseous planets located in our Solar System's outer limits: Jupiter, Saturn, Uranus and Neptune. The four solid inner planets--Mercury, Venus, Earth and Mars--are almost entirely moonless. Earth is the only inner planet that hosts a large Moon, while Mars sports only a pathetic duo of misshapen little Moons (Phobos and Deimos), that are either captured asteroids that escaped from the Main Asteroid Belt between Mars and Jupiter, or are instead the outcome of a primordial collision between Mars and a large protoplanet.