Universal theory of planetary satellites appearance created by scientists


02/12/2012

A group of French astrophysicists from the Sorbonne and the University of Sofianopolis created the first time a theory that allows for a single logic to explain how the planets were formed all the satellites that are in the solar system.

Satellite formation comes from the matter of gas and dust disk, which rotates around the planet in a "youth", the number and size of satellites depend on the rate of expansion drive on exit from the influence of the planetary gravitational forces, according to an article published in Science.

The satellites of gaseous giant planets, scientists believe, are formed from a disc of gas and dust where the substance during its expansion falls beyond the scope of a conditional around the planet, or Roche limit (education there can not be a single body, and the small particles in orbit are subject only to gravitational forces of the planet). This raises the question of how some of the planets, such as Jupiter may have formed several satellites, of which the "external" revolve in orbits located in the far distance beyond the lobe.

Circumplanetary expansion drive, according to the authors, could occur separately, and the size of the next satellite is caused by the amount of material ejected at the Roche limit. The "old" satellites at the same time, gradually moving away from the planet, giving place to new.

In addition, the scientists concluded that the mechanism of formation of satellites is universal and suitable for Earth-like planets, and not just for the gaseous giant planets. Each planet in the solar system, according to the authors, in the early stages of development had gas and dust disk, similar to the rings of Saturn. The quantity of satellites while dependent on the rate of expansion drive force due to the gravitational effects of the planet, as well as the mass of the disc material.


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