How many years has the earth existed? How many years has the earth existed

The current lifespan of the Earth is 4.6 billion years, and it is still unknown how long the Earth will exist in the future. Here are the references. How long is the life span of the earth?

The Earth is speculated to have survived for 4.6 billion years, but how long will it live? Scientists believe that if the Earth is allowed to move freely, it may exist forever, but if other external factors interfere with it, the Earth may have an end of life. The external factor is the sun in the first place, because it is the closest planet to the earth and can have a destiny on the right earth That is to say, all the energy and power on the earth come from the sun, and once the sun has three long and two short, it is bound to affect the earth.

Before the 30s of this century, people always thought that the sun would one day burn out, turn from white to orange and then to red, and finally become a dark star that was silent, but its brilliant life. In the 30s, when physicists learned the mystery of the sun's light, the situation was very different. It turns out that the Sun's energy comes from its thermonuclear reactions, and the Sun's lifetime will pass through the gravitational contraction phase, the main-sequence star phase, the red giant phase, and the compact star phase.

The main sequence phase is the period of stability of the Sun. This phase will last for 10 billion years. At present, the sun is only halfway through and is in middle age.

Once the Sun reaches the red giant stage, then the end of the Earth is coming. Of course, this is billions of years away. Are there any other factors besides the sun's interference with the earth?

Some scientists believe that the Sun may have a brother, a companion star of the Sun, which orbits the Sun day and night, and every 26 million years, turns to the closest place to the Sun"Make waves"Its strong gravitational pull will cause a large disturbance of many comets, and 1 billion comets will be on a rampage in the solar system, and the Earth and other planets will become these comets"Target"。If the mass of the comet that collides with the Earth is large enough, the consequences are unimaginable: the extinction of light organisms and the upheaval of ecology; Heavy landslides and earth cracks, the earth"Broken bones"。

However, this solar companion star, which could bring misfortune to Earth, has not been discovered, although many scientists believe it exists.

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 body structure of the human body allowed the human forelimbs to move freely, which allowed the intelligent human to master the use of tools far beyond that of any other species, and eventually developed great labor ability and creativity. Man is a higher social animal.

Current research suggests that the age of the Earth is about 4.6 billion years old, that is, the Earth has been around for 4.6 billion years.

In recent years, isotopic dating has been used to determine the age of the earth's crust. One of the most commonly used methods is called the uranium-lead method. Uranium is a radioactive element that, under natural conditions, metamorphoses at a certain rate, eventually forming two elements, lead and helium.

This metamorphosis process is very steady and at the same time extremely slow. It takes about 4.5 billion years for uranium, which has an atomic weight of 238, to lose half of its original mass. Therefore, we can calculate the age of the rock with some accuracy based on the ratio of uranium to lead that it now contains.

The oldest rock measured in this way is 4 billion years old. So it is estimated that the age of the Earth is about 4,54.6 billion years.

The earth has a history of 100 million years, the sun is formed from a supernova after the nebula remnants, and then the surrounding heavy elements slowly gather under the action of the sun's gravity to form the earth, mercury, venus, mars, jupiter and other eight planets.

The Earth was formed 4,04.6 billion years ago. The Earth, as a planet, is thought to have originated from the primordial 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.

The Earth system ranges 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 geomorphological changes, life phenomena and life activities together constitute the history of the earth.

Earth is one of the eight planets in the solar system, the third planet in order from near to far, 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.

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

The radius of the Earth's equator is kilometers, the polar radius is kilometers, the average radius is about 6371 kilometers, and the equatorial circumference is about 40075 kilometers. The Earth's surface area is 100 million square kilometers, of which 71% is oceans and 29% is land. The main components of the atmosphere are nitrogen and oxygen, as well as small amounts of carbon dioxide and argon.

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