Planet Earth is the collision between two planets

Planet Earth is the collision between two planets

The giant impact hypothesis proposes that the Moon was created from ejected material  by a collision between the young Earth and a body the size of Mars named Theia. This scientific hypothesis is the most sustained to explain the formation of theMoon.

Theia Planets, Earth This impact would have occurred 42 million years after the birth of the solar system, is there 4,526,000,000 years

Hypothesis

There 4,533,000,000 years- about 34 million years after the formation of the Earth - that planetoid the size of Mars (6500 km in diameter)would have hit the Earth at 40 000 km / h under a angle, oblique destroying theim pactor and ejecting it and a portion of the mantle Earth's into space.Computer simulations of such an event, suggested that approximately 2% of the original mass of the impactor would have produced a ring of debris. orbital By accretion,between one and 100 years after the impact, half of the debris would have given birth to the Moon.

searches,

In 2012 analyzing samples from the missions, Apollo researchers have shown that the Moon had the same  isotope composition titanium than Earth, which is opposed to the hypothesis of the giant impact in that it would be reasonable to find different materials from both sources.Earth and Theia the hypothetical object

In October of the same year, researchers at Washington University in St. Louis and the Scripps Institution of Oceanography published a paper in Nature that supports the hypothesis of the giant impact by analyzing zinc isotopes,then in 2014, it was the turn of a German team to reinforce this theory, this time devoting its study to the relative proportion of oxygen isotopes in lunar samples brought back by the Apollo missions.

Theia impact on Earth

New Discovery in 2014

The consequences of the collision between the Earth and Theia would have been major for our planet and are the basis for the development of complex life. Theia would be responsible for a string of complex events essential to life on Earth.

This collision would have allowed the Earth to become much more massive since the latter would have absorbed some of her twin on impact.

It would thus causing an increase in the severity of the Earth. It is estimated that the "proto-Earth" (before the giant impact) was very similar to Venus.This increase in the severity allowed to retain all the more gas the primitive atmosphere.

With this atmosphere,all the comets that struck us later, disintegrated to make way, after several years, to a quantity total water equivalent to half of all the water on Earth.

Theia would also have been vital to our planet by allowing the Earth to inherit a larger nucleus.Combined with the rotation of the Earth, this new core, more massive and essentially iron, is the origin of magnetosphere Earth's that protects us from deadly radiation from the solar wind.

Our Solar System

An increase in the size of the nucleus would also have the effect of increasing the intensity of mantle convection.The core is more massive and disseminating a stronger energy, the mantle of molten rock would have started to rise towards the surface of the Earth, creating volcanoes through the intrusion of magma between tectonic plates. Many eruptions ensued , releasing into the atmosphere huge amounts of carbon dioxide and methane.

The release of these gases would have created a greenhouse effect and would have allowed the Earth to warm. Following this change, the water vapor sent volcanic eruptions have finally been able to accumulate in clouds and half of all the water on Earth would have fallen as rain.

The Moon,serving shield against geocruisers protected our planet many disasters, as evidenced by the impact craters on its surface.

The last contribution Theia would have been able to stabilize climates and temperatures.After being sprayed herself by hitting us, Theia would have left debris orbiting the Earth, debris partly Theia and part of the mantle of the proto-Earth.

This debris, which largely had to First, form a ring around the Roche limit,eventually amalgamate with time a celestial body, the Moon. This is due to the pull of the Moon on the Earth that the precession takes 25,800years.

Without this so massive moon, the inclination of the axis of rotation of the Earth would be chaotic,swing erratically in the geological time scale, almost from 0 to 90 °. Climates would change at all in all, it would have been very unfavorable to the development of advanced life forms, especially on the continents.

Impact

According to the theory called the "giant impact", the Moon was created about 4.5 billion here years when the early Earth was violently hit by a celestial body named Theia (mother of the moon, Selene, in Greek mythology). The protoplanet was as massive as Mars and the shock was of tremendous violence. He sprayed Theia and much of Earth's envelope.

Fragments and origin of the line

Part of vaporized rock cloud would again be aggregated to the Earth,while the other part would be solidified not far away, giving birth to our satellite.

A tiny difference

Most models indicate that the moon is made ​​of 70 to 90 percent of materials from Theia, the rest coming from the Earth's crust. The majority of planets in the solar system with a specific isotopic composition, it should be recognized in the lunar samples of the elements of the old Theia. But they escaped far to the analyzes, which have revealed that although the water of the Earth and its satellite had the same origin and the composition of certain elements like zinc comforted the hypothesis of the impact giant.

Oxygen

A group of German researchers may have finally found a trace of Theia in Selenes samples brought back by missions, Apollo 11  12 and16.They studied the ratio O17 / O16 two oxygen isotopes, whose distribution varies much from one planet to another. Their analysis revealed a slightly different composition ofisotopes oxygen in lunar samples. This very small difference supports just over the giant impact hypothesis for the formation of the Moon things..:

An idea of the geochemistry of Theia

"The differences are small and difficult to detect, but they are there This means two  First, we can now be reasonably certain that the giant collision has occurred. Second, it gives us an idea of the geochemistry of Theia "says Daniel Herwartz, lead author of the study." The next goal is to how many hardware Theia is present in our satellite.

"Mostmodels bend to 70 to 90% but other grant just 8% for the contribution of Theia the lunar mass. According to the authors of the study who publish their findings in the journal Science,the Moon could be composed half of Earth materials and half of material from Theia. Fine example of heavenly equity, which asks for confirmation...

Origin of the Moon

http://www.sciencesetavenir.fr/espace/20140610.OBS0004/on-a-trouve-des-traces-de-theia-dans-la-lune.html

http://fr.wikipedia.org/wiki/Hypoth%C3%A8se_de_l'impact_g%C3%A9ant