Do you know how the Earth formed? It all started with a tremendous blow.Somewhere in our galaxy a star exploded, throwing masses of gas and dust.This supernova, as these explosions are called, happened about 5 billion years ago. remnants of the explosion then crashed into a nearby gas cloud, gathering the ingredients for our solar system to form.
Do you know how the Earth formed? Extraordinary
Because the explosion was so energetic, it made the powder mixture get very hot and things began to "cook." The dust pieces began to clump together, making lumps larger and larger , and the mixture began to gather under its own gravity.
At one point, the central bulge became so hot and dense that it began to generate its own energy, lighting nuclear fires This was the birth of our sun .The rest of the dusty mixture swirled around the star, fanning on a disk.
Gradually the sun grew to reach Current size and the dusty disk cooled.For millions of years, the dust clustered in grains, then lumps, rocks and finally in planetesimals, pieces of rock large enough to have their own gravitational field.Some of these planetesimals became the embryonic forms of the plane tas in our Solar System.
Little by little, these rocky planets began to organize and establish themselves at a comfortable distance from the Sun and find their own orbit. The Earth found its way as third planet close to the Sun. In the early days, rocky accumulations were still common, leaving craters on the surface of all the planets.
It is believed that one of these collisions, about 4,500 ago million years, almost destroyed the Earth and was probably responsible for our moon.It is thought that a large planetesimal, of the size of Mars, hit the Earth a blow, taking a piece of the earth's crust into space Some of the planetesimals merged with the Earth, while the ejected bulge found its own orbit around our planet and became the Moon that we like so much to admire today.
The evidence for this theory comes from samples of lunar dust, showing that the moon is made of rocks quite similar to those found in the upper layers of the mantle and Earth's crust.
The shock of the Moon's formation hit the Earth from the side, changing its angle of inclination to the sun from 0 degrees to 23.5 degrees.As a result, the Earth began to have seasons : winter for the hemisphere inclined away from the sun, and summer for the hemisphere inclined towards the sun.
The Early Earth was a very different place from the planet we inhabit today.Initially, the planet did not have a crust, mantle or nucleus, and instead all the elements were uniformly mixed. There were no oceans, no continents, no atmosphere. Meteor collisions, des Radioactive integration and planetary compression caused the Earth to become increasingly hot.After a few hundred million years, the Earth's temperature reached 2,000 ° C, the melting point of iron, and the nucleus of the Earth.
At this point much of the Earth was molten and there may have been an ocean of magma on the surface. Gradually, the Earth cooled and the planet I settle its core, mantle and crust.This stratification of the planet helped unleash plate tectonics on the surface and the Earth began to look a little more like the planet we know today.
Most of the geologists believe that the atmosphere and Earth's oceans arrived about 4 billion years ago, product of multiple volcanic eruptions.Alternatively, it is believed that a series of comets that collided with the Earth released water and gases on the surface.
The early atmosphere of the Earth did not contain much oxygen and was very different from what we have today.However, the atmosphere and the oceans allowed life to settle down, and the first single-celled organisms began to evolve about 4 billion years ago. The scene was prepared for complex life to evolve, until today.
If you liked this topic, don't miss our article on 6 theories about the Origin of Life to know.
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