When did the earth come into being, and when did the earth come into being

In the past 30 years, scientists have used radioisotope dating to obtain a series of data related to the age of the earth: zircon obtained in the rocks of Western Australia has been measured to be 4.2 billion years old, although this zircon is redeposited in Mesozoic rocks, it is enough to show that the age of the earth is not less than this data; Many of the rocks obtained from the Moon are more than 4.6 billion years old, and since the Moon is a satellite of the Earth and a member of the solar system, the age of the Earth should not be less than the age of the Moon; The ages obtained from a large number of meteorites from the solar system are also between 4,64.7 billion years. According to the basic principle of the identity of the origin of the solar system, the age of the Earth should be more than 4.6 billion years.

The question of the origin of the earth is actually also the question of the origin of the solar system and the planets. In the early days of the evolution of the solar system, the primordial dust clouds that formed the planets began to accumulate, forming a series of rings and forming some condensation centers. These centers, large and small, begin to attract surrounding material, forming asteroid-like rock masses that collide with each other.

Because these rocks are roughly in the same orbital plane and move in a similar direction, the formation of the impact slowly changes, forming a slightly larger accumulation center than the periphery, and eventually forming planets and moons. The impact occurred about 4 billion years ago, possibly 51 billion years ago, and the Moon, Mercury and numerous asteroids still fill the craters of the impact. However, the surface morphology of planets such as Earth, Venus, and Mars with complex internal and external dynamic processes has been modified for a long time, and the number of craters preserved is extremely limited, but traces of meteorite impact can still be identified.

Meteorite impact events are actually an inevitable process in the formation of the solar system, and meteorite impact events are not only the cause of planet formation, but also one of the main reasons for the divergence of the Earth's sphere.

The formation of the geosphere structure is closely related to the early meteorite impact events of the solar system. For rocky planets (terrestrial planets), an important reason for the formation of the sphere is the need for a high temperature to keep the planets in a molten state, which differentiates according to density under the action of gravity. In the early days of the Earth's formation, there was a primordial atmosphere, which was composed of hydrogen and helium, like other celestial bodies in the universe.

Because terrestrial planets are relatively close to the sun, and the masses of planets are relatively small, the gravitational force generated is also relatively small, and hydrogen and helium gases are easy to escape into outer space, and they quickly disappear under the action of solar wind. Therefore, the atmospheres of terrestrial planets have secondary **, and the formation of the Earth's atmosphere is closely related to the internal degassing of the Earth.

No one can say for sure, the planet was created in countless star-to-star collisions, and no one knows when the earth existed, so I suggest you go to see Doraemon, maybe you will know.

You can take a look at Hawking's great theory of the universe, a more convincing point of view in modern times.

When was the Earth born?

The Earth is generally thought to have been born 4.6 billion years ago.

It is believed that the Earth and the solar system, including the Sun, were born at the same time. About 5 billion years ago, there was a huge piece of nebulous material. The density is very high, and due to the influence of its own gravitational effect, the shrinkage and aggregation first form the sun.

After a series of physical and chemical changes, it became the sun it is today (such as thermonuclear reactions). The remaining smaller clouds form other planets and moons, comets and other celestial bodies in the solar system.

Earth is one of the eight planets in the solar system, the third in order of near and far from the sun, and it is also the terrestrial planet with the largest diameter, mass and density in the solar system, 100 million kilometers away from the sun. The Earth rotates from west to east while revolving around the Sun. It is 4,04.6 billion years old, and it has a natural satellite, the Moon, which forms a celestial system, the Earth-Moon System.

The Earth's equatorial radius is kilometers, the polar radius is kilometers, the average radius is about 6371 kilometers, and the equatorial circumference is about 40076 kilometers. The surface area of the earth is 100 million square kilometers, of which 71% is oceans and 29% is land.

The interior of the earth has a core, mantle, and crust structure, and the outside of the earth has a hydrosphere, atmosphere, and magnetic field. The Earth is the only celestial body in the universe where life is known to exist, and it is home to millions of living beings, including humans.

The Earth was formed about 4.5 billion years ago. The rocky planet was originally just dust floating in space. This dust comes from the size of a huge, ancient star at the end of its life.

The earth can also be divided into 5 since its formation"generations"From ancient times to the present: Archean, Proterozoic, Paleozoic, Mesozoic and Cenozoic, and some generations are further divided into several"Discipline"For example, the Paleozoic Era is divided into Cambrian, Ordovician, Silurian Period, Huihe Devonian, Shizhisotan and Permian from far to near; The Mesozoic is divided into Triassic, Jurassic, and Cretaceous; The Cenozoic is divided into the Tertiary and Quaternary epochs. This is the roughest division of the historical periods of the earth, which we call them"Geological time"。

The systematic scientific study of the origin and evolution of the earth began in the middle of the eighteenth century, and several theories have been put forward to this day. It is now popular to believe that the Earth, as a planet, originated from the primordial solar nebula 4.6 billion years ago.

Like other planets, it has undergone some common physical evolutionary processes such as accretion and collision. At the beginning of the formation of the earth's fetus, the temperature was low and there was no layered structure, and it was only due to the bombardment of meteorite material, the heat caused by radioactive decay and the gravitational contraction of the primitive earth that the earth's temperature gradually increased. As the temperature rises, the earth's internal materials become more and more plastic, and there is a phenomenon of local melting.

At this time, under the action of gravity, the differentiation of matter begins, the heavier material near the surface gradually sinks, the lighter material inside the earth gradually rises, and some heavy elements (such as liquid iron) sink to the center of the earth, forming a denser core (** wave observations show that the outer core of the earth is liquid). The convection of matter was accompanied by large-scale chemical separation, and finally the Earth gradually formed the layers of the crust, mantle, and core that it has today.

In the early days of Earth's evolution, the primordial atmosphere escaped. With the recombination and differentiation of matter, various gases that were originally in the earth's interior rose to the surface to become the second generation of atmosphere; Later, due to the photosynthesis of green plants, it was further developed into a modern atmosphere. On the other hand, the temperature of the Earth's interior increases, which vaporizes the crystalline water inside.

As the surface temperature gradually drops, the gaseous water condenses and rainfalls to the ground to form a hydrosphere. About.

Three or four billion years ago, single-celled life began to appear on the earth, and then gradually evolved into a variety of organisms, until advanced organisms such as humans constituted a biosphere.

There are some theories about the origin of the earth in various periods, but there is no one that can fully prove it, after all, the time involves billions of years or more, and it is difficult to prove the evidence that has been preserved. In the field of social sciences, since 1543, the Polish astronomer Copernicus put forward the heliocentric theory, the discussion of the evolution of celestial bodies began to enter the scientific category, and gradually formed theories such as the nebula theory, the encounter theory and other theories. But in fact, any hypothesis about the origin of the earth has yet to be proven.

At present, there are similar theories to the origin of species, evolutionary metamorphosis, natural generation (nebula formation), and capture (but this point remains to be proved before the capture of the origin of the argument), in short, there is no concrete argument at present, and there is no way to support it.

When did the earth begin to have the answer: In ancient times, people had the question of the formation of all things in the heavens, including the earth, and various myths about the creation of the world were also widely spread. Since 1543, after the Polish astronomer Copernicus proposed the heliocentric theory, the discussion of the evolution of celestial bodies began to enter the scientific category, and gradually formed theories such as the nebula theory and the encounter theory.

But in fact, any hypothesis about the origin of the earth has yet to be proven.

The earth was formed billions of years ago, and the traces of the early days are difficult to find on the ground, and the subsequent history is extremely incomplete. It is extremely difficult to push the original situation from the face of the earth step by step. Any hypothesis of the origin of the earth contains hypotheses that need to be proven.

Because of this, different hypotheses often diverge greatly. For more than 200 years, dozens of hypotheses have been proposed about the origin of the earth. By the time of artificial satellites, the field of direct detection had expanded to interplanetary space.

The exploration of this issue has also entered a new active stage.

Hello. 4.6 billion years ago, the Earth was born. Earth's evolution can be broadly divided into three stages. It is 4,04.6 billion years old,[1] and it has a natural satellite, the Moon, which forms a celestial system, the Earth-Moon System.

It is believed that the universe was formed by a dense and hot singularity that expanded after a large ** 13.7 billion years ago.

About 4.6 billion years ago, the sun was born, and so was the earth.

The age of the Earth is about 4.6 billion years. There was no trace of life on the early Earth, and the fossil record of life dates back 3.5 billion years.

Ancient and modern Chinese and foreign scientists have their own investigation basis and exposition. Even religion has its own discourse. Either way, the Earth was created at least 4.5 billion years ago.

The earliest known rocks are about 4.6 billion years old (radioactive measurements), and the formation of the Earth is supposed to be hundreds of millions of years earlier.

The Earth was formed about 4.6 billion years ago. And the formation of the sun was about 5 billion years ago.

Billions of years ago, it was said that the earth was created due to the universe.

The Earth existed 600 million years ago.

The day the Earth was formed began to exist.

A: We have had it since the day we were born.

In my opinion, this kind of question is actually not clear, and the real age of the earth that people often say is not necessarily true, because this is only the research of scientists, but it is not necessarily completely correct, don't be overly superstitious about science! But you can't distrust science

4.6 billion years ago, the Earth originated from the primordial solar nebula. Earth's evolution can be broadly divided into three stages.

Between 4.6 billion and 4.2 billion years ago was the period of formation of the Earth's sphere. The Earth began as a red-hot ball of hot liquid matter, mostly magma. Over time, the temperature of the earth's surface continues to drop, and a solid core gradually forms.

The dense material moves towards the center of the earth, and the less dense material (rocks, etc.) floats on the surface of the earth, which forms a earth whose surface is mainly composed of rocks.

Between 4.2 billion and 540 million years ago was the Archean and Proterozoic periods. The earth is constantly releasing energy outward, and the water vapor, carbon dioxide and other gases released by the continuous eruption of high-temperature magma constitute a very thin early atmosphere --- primitive atmosphere. As the water vapor in the primeval atmosphere continues to increase, more and more water vapor condenses into small water droplets, which then converge into rainwater and fall to the surface.

And just like that, the primordial ocean was formed.

540 million years ago to the present is the Phanerozoic period. The duration of the Phanerozoic is relatively short, but during this period, the organisms and their flourishing, the geological evolution is very rapid, the geological processes are rich and colorful, and the geological bodies are all over the world, widely preserved, which can be observed and studied very well, and are the main research objects of geological science, and the basic theories and basic knowledge of geology have been established.