Theia the planet that impacted the Earth.

The scientific journal Nature has recently published research carried out by geologists from the California Institute of Technology that seeks the answer to the impact that the earth suffered with theia or thea in its origins, forming the moon and the earth as we know it today. This topic of impact between planets is not new, the theory of the Great Impact was first raised at a conference on satellites in 1974 and was later published in the scientific journal Icarus by William K Harman and Donald R. Davis in 1975, this theory suggests that the Earth collided with a planet at least the size of Mars, that impact would explain why we have such a large moon in proportion to the size of the Earth. Our beloved moon is the fifth largest satellite in the solar system and would also explain why the Earth has such a dense metallic core, the earth is the planet that has the highest density, the highest surface gravity, the largest magnetic field and rotation fastest of the four rocky planets.

The solar system arose about 4.6 billion years ago due to the collapse of a large cloud of dust and gas, possibly due to the push it received from the shock wave from the explosion of a nearby star, a supernova; Most of the matter in the cloud was concentrated to form the sun, only a few crumbs of material remained, 0.2%, with that rest the planets were created and every planet begins with a speck of dust. At the origin there were an infinite number of motes of dust that were united by “self-organization”, chaos theory explains self-organization in terms of islands of predictability in a sea of chaotic unpredictability but it is not a strange thing, in reality it surrounds us by Everywhere, we find self-organization in the crystallization in the formation of a snowflake for example or in the coordinated movement of flocks of birds. But also in those infinity of specks of dust, magnetism flowed powerfully, which played a fundamental role in grouping the dust grains and creating collision routes where the grains merged until they formed increasingly larger objects that reached the size of 1 km in diameter, from there astronomers call these objects planetesimals since they would be like the seeds of the planets.

It is believed that some original and unaltered planetesimals still survive, specifically Arrokoth, it is a contact binary object 36 km in diameter and astronomers consider it the first ancient planetesimal visited by a NASA New Horizons spacecraft that visited it. In 2019, the important thing and that is why astronomers make the difference is that from that size, from 1 km or so in diameter, gravity comes into play as the main engine in the growth of planetesimals until their next stage, that of protoplanets, if the planetesimals were the Seed, the protoplanets are the germs of the planets. They would be large objects of 100 to 1000 or 2000 km in diameter, in them gravity differentiates their interior creating a core, a mantle and a crust in addition to creating the characteristic spherical shape of the planets, it is believed that the dwarf planet Ceres would be the last surviving protoplanet in the inner solar system.

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