Tell me where you come from, our Solar System Origin of Life - an exciting topic. Life is a multi-faceted, and it fizicheksaya, and biological, and psychological, and social ... But, above all, life space.
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Tell me, where have you come, our solar system?
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For two centuries, the problem of the origin of the solar system excites great thinkers of our planet. This problem involved, ranging from the philosopher Kant and Laplace mathematics, a galaxy of astronomers and physicists of the XIX and XX centuries.
And yet we are still quite far from a solution to this problem. But over the past three decades cleared the question of how the evolution of stars. And although the details of the birth of a star nebula of gas and dust is far from clear, astronomy gives a clear idea of what was happening to her over billions of years of further evolution.
Turning to the various cosmogonic hypotheses that succeeded one another over the past two centuries, starting with the hypothesis of the great German philosopher Kant and the theory that a few decades later independently proposed by the French mathematician Laplace. Background of these theories have stood the test of time.
The point of view of Kant and Laplace in a number of important issues differed sharply. Kant came from the evolutionary development of cold dust nebula, in which first emerged a central massive body - the future of the Sun, then the planet, while the Laplace considered the original nebula of gas and very hot with high speed. Contracting under the force of gravity, nebula, due to the law of conservation of angular momentum, spun faster and faster. Due to the high centrifugal forces consistently separated from him the ring.
Then they condense to form planets.
Thus, according to the hypothesis Laplace planets formed before the sun. However, despite the differences, the common and important feature is the idea that the solar system is the result of natural development of the nebula. Therefore, this concept is called Kant-Laplace hypothesis.
However, this theory is faced with the difficulty. Our solar system consists of nine planets of different sizes and masses, has a twist: an unusual distribution of angular momentum between the central body - the Sun and the planets.
Angular momentum is one of the most important characteristics of all isolated from the outside world of the mechanical system. That is how such a system could be considered the Sun and its surrounding planets. Angular momentum can be defined as stock rotation system.
This rotation is the sum of the orbital motion of the planets and the rotation around the axis of the sun and planets.
The lion's share of angular motion of the solar system concentrated in the orbital motion of the giant planets Jupiter and Saturn.
From the point of view of the hypothesis of Laplace, it is unclear. In an era when the initial, rapidly rotating nebula separated ring nebula layers from which then condense said Sun had (per unit mass) is about the same time as the substance exuded the ring (so the angular velocity of the ring, and the remaining parts were about the same) because the mass of the latter was significantly less than the main nebula (proto), the total angular momentum of the ring should be much less than the proto. In the Laplace hypothesis lacks any mechanism for transferring torque from the proto to the ring. Therefore, for all further evolution momentum proto, and then the sun must be much greater than the rings and formed of them planets.
But this conclusion is contrary to the actual distribution of traffic between the Sun and the planets.
For the hypothesis of Laplace, this difficulty was insurmountable.
Let us dwell on the hypothesis Jeans has gained acceptance in the first third of this century. It is completely the opposite of the hypothesis of Kant-Laplace. If the latter draws the formation of planetary systems as the only natural process of evolution from simple to complex, the hypothesis Jeans formation of such systems is a matter of chance.
The original material from which the planets were formed later, was ejected from the Sun (which by that time was already old and similar to the present) with a random passing near him a star. This passage was so close that it can be considered almost as a collision. Due to the tidal forces from the star to the Sun flown from the surface layers of the Sun ejected a jet of gas.
This jet will remain in the field of attraction of the sun and after a star goes from the sun. Then jet condenses and will give rise to planets.
If the hypothesis is correct Jeans, the number of planetary systems formed over ten billion years of evolution, can be counted on the fingers of one hand. But actually many planetary systems, therefore, this hypothesis is untenable. And it does not follow that the jet is ejected from the solar hot gas may condense into planets.
Thus, the cosmological hypothesis Jeans was untenable.
A prominent Soviet scientist Otto Schmidt in 1944 proposed his theory of the origin of the solar system: our planet was formed from the material captured from a gas-dust nebula through which once held the Sun, which took almost already a modern look. However, no difficulties with the rotation of the planets moment did not arise, since the time of the original cloud of matter can be arbitrarily large. Since 1961, this hypothesis developed English cosmogonists Littleton, who really made a significant improvement.
According to both hypotheses almost modern Sun faces a more or less loose space object, capturing part of its substance. Thus, the formation of planets associated with the process of star formation.
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Our Improbable Solar System | Space News
How old and how stable is our solar system? On this question, astronomers have grown more uncertain year by year. The actual history of the planets could be a far cry from anything we learned in school.
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