The impact that changed the course of the earth.

Theia is the name of the planet that collided with the Earth, it comes from Greek mythology, it was a Titanide mother of the Moon goddess Selene, the hypothesis of the great impact of planets, as it is called, 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, that publication was in 1975.

This initial hypothesis was gradually enriched with more evidence, data and even with findings of remains of Theia itself, since it was not completely destroyed and pulverized, there are still fragments of it inside our planet, without that cataclysm, without that cosmic impact, life on Earth would not have arisen or it is very possible that it would not have gone beyond the level of bacteria.

Because, to begin with, the collision caused Theia's metallic core to fuse with that of the Earth. It was the fundamental element that Tella provided and that provided the Earth with a large and hot core, or in other words, a very strong planetary heart, capable of creating a protective magnetic field that has been functioning for billions of years, much longer than, for example, on Mars or Venus.

The impact of the planet Theia against the Earth also influenced the speed at which our planet rotates, that is, the length of the days, without that impact and the birth of the Moon, the days of our planet would be much shorter, perhaps they would last about 15 hours and that would not be the worst, thanks to the Moon, our large moon, which is the fifth largest natural satellite of the solar system, thanks to it the Earth is very stable.

In documentaries they sometimes say that it acts like an anchor, but it doesn't seem like a correct example to me, it would be something more comparable to the action of a lateral float of the Polynesian catamarans, the so-called AMA, and that serve to stabilize the ship, the moon does something similar, if it weren't for the Moon, the Earth would tumble across the space ocean and if it weren't for the moon, periodically those tumbles would cause the poles to end up pointing towards the sun, while the Equator would be frozen.

J. Laskar, a French astronomer from the Paris observatory, together with other colleagues, carried out a series of calculations in 1993 and came to the conclusion that if we did not have the Moon, cycles of approximately 500,000 to 2 million years would occur, where the axis of the Earth would tilt almost to 90º, that means that for hundreds of thousands of years in a row one of the poles would look almost directly at the sun, of course, it would not be frozen, it would be a scorching desert, while the equator would be covered in ice, if this sounds bad to you, wait, because it gets even more terrible.

With the earth lying flat for six months straight, the entire hemisphere facing the sun would receive sunlight almost 24 hours a day, while the other hemisphere would be in total darkness 24 hours a day, a 6-month polar night. This situation would balance until reaching the equinox, where the roles are reversed and the hemisphere that had been in darkness enters a 6-month phase of scorching sun.

And it would be like this for several hundred thousand years until the axis of the planet straightened itself little by little, reaching a situation similar to the current one and even becoming completely straight and then lying down again in a cycle of between half a million to 2 million years, as I told you before.

The above would change the scheme of life on Earth, because currently the ice is limited to the polar areas and the hottest area is the one that surrounds the Equator and so on in a stable way, but in that world Earth without the moon, in that Earth that is being so battered, the oceans would freeze or boil in the regions exposed to darkness or the permanent sun and that steamroller of ice and fire would cyclically travel around the entire planet, it would not be limited to an area, but with the passage of time the entire planet would be exposed to such rigorously extreme climates, making it very difficult for life forms to survive and, above all, to evolve.

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