How old is the Earth?

<> 4.6 billion years.

2. Earth is one of the eight planets of the solar dead branch system, ranking third in order from near to far from the sun, and it is also the terrestrial planet with the largest diameter, mass and density in the solar system, which is 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.

It originated from the primordial solar nebula 4.6 billion years ago.

The Earth has survived for 4.6 billion years. Humans were born 5 million years ago. That is to say, 60 million years after the extinction of the dinosaurs, human beings were born, and humans were differentiated from the animal kingdom, and taxonomically, homo sapiens belong to the subphylum Vertebrates, Mammalia, Primates, Anthropoids, and Homo.

About 4.5 million years ago, humans and apes began to diverge, giving rise to Australopithecus ramanacus, which later evolved from Australopithecus australopithecus 2 million years ago, and then further developed into modern humans. Human is an umbrella term for human beings. Biologically, humans are classified into the general kingdom eukaryotic kingdom Eukaryotic subkingdom Zoological kingdom Posterior Mouth Animals Total phylum Chordates Vertebrate subphylum Amniotic general order Mammalian subclass Euzoomia subclass Primate ape suborder Narrow-nosed monkey suborder Homo sapiens subfamily.

Human beings can be defined on biological, spiritual, and cultural levels, or a combination of these definitions. Biologically, man is classified as a hominida, homin, hominid, a higher animal. On a spiritual level, man is described as being able to use the concept of a variety of souls that are believed in religion to be associated with divine power or spiritual immortality.

People:"Able to manufacture delicate tools, and be able to skillfully use tools for labor, have rich thinking ability, have the ability to judge that there is no conflict with the actual situation and conflict with the actual situation, have the ability to initially maintain the earth's ecosystem, have the ability to create and control the restoration"People should live in harmony with each other, and trust and communication are the most basic ways of survival between people. Evolutionary studies suggest that humans originated from forest apes and evolved step by step from primates through a long evolutionary process.

DNA and fossils prove that humans originated in Africa about 3 million years ago. Compared to other animals, humans have highly developed brains, complex abstract thinking, language, self-awareness, and problem-solving skills. The erect structure of the human body allows the human forelimbs to move freely, which allows the intelligent human to master the ability to use tools far more than any other species, and ultimately to develop great labor ability and creativity.

Man is a higher social animal.

4.6 billion years Before the advent of humans, the earth existed long ago, and it was very old.

How can human beings know the age of the earth? This is indeed not a simple question.

Before the scientific method was found, people could only guess when the heavens and the earth were created from ancient myths and legends.

For example, in 1654, an archbishop of Ireland actually proved from the Hebrew scriptures that the earth was created by God at 9 a.m. on October 26, 4004 B.C.

This absurd statement was believed in Europe at that time! In order to understand the true age of the earth, many scientists are doing this exploration.

In 1862, the British physicist Kelvin first discussed the age of the earth from the point of view of physics.

He had assumed that the earth was originally a hot liquid, which later solidified and cooled.

Based on his calculations of heat conduction, he deduced that the time elapsed from the solidification of the earth to its current state was about 20 million years and 40 million years.

After the publication of his calculations, the academic community did not admit it, especially geologists believed that his data could never be considered as the entire age of the Earth.

Because of the fact observed from nature, the earth's crustal movement is not a single activity and there are no new changes, and the actual orogeny movement can even occur more than 15 times in the history of the earth.

Therefore, the determination of the crustal age of the entire Earth with the last change of rocks is in any case unacceptable.

Moreover, it is not necessarily correct to assume that the earth was first in a liquid state in the first place.

The Earth is about 4.6 billion years old. The universe was born 15 billion years ago, laying the material foundation for the creation of the earth. The Earth as a planet originated from the primordial solar nebula 4.6 billion years ago.

Since then, the Earth system has evolved from simple to complex, and the evolution of its components is both interconnected and mutually influential. The movement of the earth system and the resulting changes in the landscape, life phenomena and life activities together constitute the history of the earth.

The systematic scientific study of the question 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 generally believed that the Earth, as a planetary leaky star, originated from the primitive solar nebula 4.6 billion years ago. Earth, like other planets, has undergone a number of common physical evolutionary processes, such as accretion and collision.

In astronomy's theory of the age of the earth, some people believe that the speed of the earth's rotation will be delayed by a certain amount of time, so as to calculate the age of the earth. Thomson used a number of assumptions and came to very dubious conclusions. Of course, science has no room for suspicion, so it is completely impossible to infer from this aspect.

Darwin considered the tides and the movement of the earth and the moon in terms of the tides, but the data obtained were far from the error drawn by Chenberlin, so it was still impossible to derive the age of the earth, but "although the theory of the tides and the earth and the movement of the moon advocated by Darwin is not complete, and the ages of the earth that he marked are not reliable, but with his painstaking work and mathematical ingenuity, he has always had his value in science." "Yes! If I can go to the trouble of doing something meaningful, like Darwin, it will be valuable, if not entirely reliable.

Instead of estimating the age of the earth by estimating and guessing in the past, it is just a list of boring data with no practical significance.

The earth is wonderful, too! It has a long history, which makes me wonder, and it also makes physicists, astronomy, and geologists difficult, how long has it existed, and today, when science is prosperous, people are not clear, and one day it will "confide" its age.