How did the Earth originate?
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There are several theories of originour planet, each of which has its own supporters and its right to life. Of course, it is impossible to determine exactly which of the theories actually describes the appearance of the Earth and whether such a theory exists at all, but in this article we will examine each of them in detail. The question of the origin of the Earth has not been fully studied to the present and does not have an absolutely exact answer.
The modern idea of the birth of the planet Earth
To date, the most recognized theory of the origin of the planet Earth is the theory according to which the Earth was formed from a gas-dust substance dispersed in the solar system.
According to this theory, the Sun appeared earlierplanets, and the Earth, like other planets of the solar system, originated from the debris, gas and dust left after the formation of the Sun. Thus, it is believed that the Earth was formed about 4.5 billion years ago, and the process of its formation took about 10 - 20 million years.
History of the development of theory
The first theory in 1755 put forward Germanphilosopher I. Kant. He believed that the Sun and the planets of the solar system arose from dust and gas that were scattered in space. Particles of dust and gas under the action of a shock wave from the Big Bang randomly moved, collided with each other, transferring energy. This formed the heaviest and largest particles, which attracted each other and eventually formed the Sun. After the sun had acquired a large size, smaller particles began to spin around it, the paths of which intersected. Thus, gaseous rings were formed in which light particles were attracted to heavier nuclei, creating globular clusters, which became future planets.
There are other theories about the origin of the Earth, which at different times were put forward by different scientists and even had their followers in the future.
Tidal theory of the origin of the Earth
According to this theory, the Sun appeared much earlier than the planets, and the Earth and other planets of the Solar System were formed from substances released by the Sun or another large star.
History of the development of theory
The history of this theory began in 1776 when the mathematician J. Buffon advancedtheory of the collision of the sun with a comet. As a result of this collision, material was released from which both the planet Earth and other planets originated.
This theory found its follower in the XXcentury. It was then that the scientist astrophysicist I.I. Wolfson using computer calculations has shown that for the separation of material, the star need not necessarily collide with the Sun. According to his theory, any large and cold star from a new cluster of stars could approach the Sun by a short distance and thus cause giant tides both on its surface and on the Sun. The amplitude of these tides increases until the material tears off from the Sun or the approaching star and takes place between these stellar bodies in the form of a cigar-shaped jet. Then the cold star goes away, and the jet that appears appears scattered on the planets of the solar system.
How the Earth was born according to the "nebular theory"
The creator of the first nebular theory wasFrench astronomer and mathematician P.-S. Laplace. He believed that there was some kind of compression-rotating gas disc; the speed of its rotation increased until the centrifugal force at its edge began to exceed the gravitational force of attraction. After that, the disk was torn, and after a while this process was repeated. Thus, the rings turned into planets, and the central mass - in the Sun.
This theory explains well the fact of the rotation of the Earth and the Sun in one plane and one direction, but it also has significant gaps.
According to this theory, the Sun must rotatevery quickly (with a rotation period of several hours). However, in fact, the sun rotates much more slowly - 1 turn in 27 days. Another drawback of the theory is the mechanism for collecting particles into planets. The theory does not answer the question of why the substances after the rupture of the disk were divided into rings, and did not take the form of the same disk, but smaller.
On this we end the story of the birth of planet Earth and recommend you read about how life appeared on our planet.