The age of the Earth? What is the age of the Earth

The ancient Chinese speculated: "Since the opening of the land to the harvest of Lin (referring to 481 B.C.), there have been 3,267,000 years." In the 17th century, a priest in the West said that God created the earth in 4004 B.C.

Such claims are pure speculation and have no scientific basis. The first attempt to use the scientific method of earth's age was the British physicist Halley. He suggested that studying the origin of ocean salinity could provide a basis for addressing the age of the Earth.

In 1854, the great German scientist Helmholtz, based on his estimation of the amount of the sun, believed that the age of the earth was no more than 25 million years. In 1862, Thomson, a famous British physicist, said that it would take 20 million to 40 million years for the earth to cool from its early red-hot state to its current state. These numbers are much smaller than the actual age of the Earth, but it is still beneficial to try it as early as possible.

In the 20th century, scientists invented isotope geometry, which is the best way to determine the age of the earth, and is the standard clock for calculating the history of the earth According to this method, the oldest rock found by scientists is 3.8 billion years old. However, the oldest rocks are not the earliest evidence left from the time of the Earth's birth and do not represent the entire history of the Earth. This is because, the infant Earth was a red-hot molten sphere, and the oldest rocks were preserved after the Earth cooled down to form a hard crust.

At the end of the 60s of this century, scientists measured rock samples taken from the surface of the moon and found that the age of the moon was between 44 and 4.6 billion years. Therefore, according to the most popular theory of nebulae of the origin of the solar system, the celestial bodies of the solar system were formed by condensation in about a period of time, it can be assumed that the earth was formed 4.6 billion years ago. However, this is speculated on the basis of circumstantial evidence.

In fact, no conclusive "archive" has been found on the Earth itself to prove that it lived for 4.6 billion years.

Scientists have used isotopes of radioactive elements to determine the age of many ancient rocks on Earth, and more than 3 billion years old rocks have been found on all continents, the oldest of which is the volcanic rocks of Antarctica, which are about 4 billion years old. After calculations and necessary corrections, it is now generally accepted that the age of the Earth is 4.6 billion years. It is also believed that it will take some time for the lava to cool down to the solid rock, so the age of the earth began to form about 50 billion years ago, which is about the same age as the age of the sun.

The age of the earth is about 100 million years.

What is commonly referred to as the age of the Earth refers to its astronomical age.

Earth's age is the time it takes for the Earth to accumulate from the primordial solar nebula to form a planet. Scientists' best estimate of the Earth's age is 100 million years.

There are several different concepts regarding the age of the earth. The astronomical age of the Earth refers to the time when the Earth began to form, which is closely related to the hypothesis of the origin of the Earth. The geological age of the Earth refers to the time from the beginning of geological processes on the Earth.

It is estimated that hundreds of millions of years have passed since the formation of the primitive Earth and has evolved into a layered Earth, so the geological age of the Earth is less than its astronomical age. The oldest known rocks on Earth are 100 million years old, and the Earth's geological age must be greater than that. Geological age is the subject of geological research; What is commonly referred to as the age of the Earth refers to its astronomical age.

Earth is the third planet in the solar system from the inside to the outside, and it is also the terrestrial planet with the highest diameter, mass, and density in the solar system. It is also often referred to as the world. The English word earth comes from Old English and Germanic languages.

The Earth is 4,446 billion years old, and a natural satellite, the Moon, orbits the Earth in a 30-day cycle, while the Earth rotates in a cycle of nearly 24 hours and orbits the Sun in a one-year cycle.

The Earth is an irregular spheroid with slightly flattened poles. The Earth rotates from west to east while revolving around the Sun. The combination of the Earth's rotation and its orbital motion gives it the day-night alternation and the seasons on Earth (the speed of the Earth's rotation and revolution is uneven).

At the same time, due to the gravitational influence of the sun, the moon, and nearby planets, as well as the earth's atmosphere, oceans, and internal materials, the direction of the earth's axis of rotation in space and the earth's body changes. The inertial centrifugal force generated by the rotation of the Earth causes the spherical Earth to gradually expand from the poles to the equator, becoming the current slightly flattened spheroid, with a polar radius about 21 kilometers shorter than the equatorial radius. The time when the Earth accumulated from the primordial solar nebula to form a planet to the present.

The current best estimate of the Earth's age is 100 million years, and what is commonly referred to as the Earth's age is its astronomical age. The astronomical age of the Earth refers to the time when the Earth began to form to the present, which is closely related to the hypothesis of the origin of the Earth.

According to scientists' calculations, the age of the earth is 4.0 billion 4.6 billion years old, and this estimate is scientifically based.

The earth is an ancient planet that exists in the solar system, and as human beings living on this planet, they are curious to know how old the earth is. Let's find out.

01 At present, the archaeological community has found that the age of the oldest rock on the earth is 4.3 billion years. Scientists believe that the astronomical age of the Earth is much longer than the age of the rocks at 4.3 billion years.

02 The age of the earth is divided into astronomical age and geological age, and the age of the earth generally refers to the astronomical age of the earth.

03 In the 20th century, scientists invented a method called isotope geometry, which is now considered the best way to estimate the age of the earth.

04 During the 60s of the 20th century, scientists found that the age of the moon was between 4.6 billion years by measuring rock samples taken from the surface of the moon. This is used to estimate that the age of the Earth is the same as that of the Moon.

05 The most widely accepted nebula theory holds that the bodies in the solar system were formed at about the same time, and the age of the Earth is estimated to be 4.6 billion years.