When did life end on Earth?

The first is the stellar lifetime of the sun, when the sun burns out, there will be no life on the earth, and the second is the meteorological changes of the earth itself, when the ice age or global subsidence comes.

As we all know, the origin of life comes from water, and water is the ** of all life, so it is not difficult to know that when water is exhausted, it is the end of life on earth.

Any planet in the universe will be destroyed. In general, the lifespan of the planet is around 10 billion years. Today, our Earth has lived in the cosmic family for 4.6 billion years.

Conventionally, it should be destroyed after 5.4 billion years. But the Sun, which is 500 million years older, will expand in 5 billion years, swallowing up water, Venus, and Earth.

So the Earth will be destroyed in 5.5 billion years.

The destruction of humanity is not nature, but humanity itself.

4.6 billion years ago, the Earth originated from the primordial solar nebula. After these 4.6 billion years of continuous evolution, the Earth has gradually formed the blue planet it is today. It is one of the eight planets of the solar system, which not only rotates from west to east, but also orbits the sun.

According to scientific records, the evolution of the earth is divided into the following three stages.

1. The first stage of the Earth's evolution is the formation of the Earth's sphere, which is about 4600-4200 mA (million years). According to scientists, the Earth is the primordial solar nebula, which was formed as a hot fireball composed of magma at the beginning of its formation. Over time, the temperature of the Earth's surface continues to drop, and a solid core gradually evolves.

The denser material gradually moved towards the center of the earth, and the less dense material gradually moved towards the surface, which formed a predominantly rocky earth.

2. The second evolutionary stage of the Archean and Proterozoic periods is the Archean and Proterozoic periods, which date from 4200 to 543 ma. The earth began to continuously release its own energy outward, constantly spewing out high-temperature magma, releasing water vapor, carbon dioxide and other gases, and then there was an early primitive atmosphere. As the water vapor in the primordial atmosphere increases, more and more water vapor accumulates together to form small raindrops, which in turn fall to the earth's surface, thus forming the primordial ocean.

3. The third evolutionary stage of the Phanerozoic period is the Phanerozoic period, which has a time limit from 543 ma to the present. This period of time is relatively short, but during this time period, the development of life on the earth is very rapid, the geological evolution is very rapid, and the geological processes have become rich and colorful. More advanced organisms gradually evolved on Earth.

These creatures already have clear shells and clear bones, new species have been added to the earth, and primitive creatures have begun to mutate or evolve.

Dear readers, do you understand?

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.

Some scientists believe that the Sun may have a brother, a companion star of the Sun, which orbits the Sun day and night, and turns away from the Sun every 26 million years.

The nearest place to come"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.

Primitive life appeared about (1 billion) years after the formation of the Earth.

Scientists speculate that about 4.6 billion years ago, when the Inner Earth was just formed, the temperature of the Earth was very high.

About 3 billion years ago, the earth entered another stage of development, the earth's original atmosphere contains ammonia, methane, hydrogen sulfide, carbon dioxide, hydrogen, water and other components, but there is no free oxygen, some gases in the atmosphere and some soluble substances on the surface of the earth's crust are dissolved in water, and a series of small molecule organic compounds are naturally synthesized under the action of cosmic rays, solar ultraviolet rays, lightning, high temperature, etc.

Amino acids, nucleotides, monosaccharides, fatty acids, etc., are collected in the primeval ocean with rainwater, thus preparing the necessary conditions for the birth of life.

These organic matter interacted constantly, and it took a very long time, about a billion years after the formation of the earth, to gradually form primitive life, so the formation of primitive life was about a billion years after the formation of the earth.

Modern science has a variety of explanations for this problem, and many scientists have calculated the so-called "time of the emergence of life" through the exploration and analysis of fossils and other relics by various instruments.

But none of us have experienced so many years of history, and the history of human civilization is only a few thousand years, and to speculate on the species of hundreds of millions of years ago, even if there is a "basis", it seems a little weak and empty.

Whenever people start thinking about these questions about origins, they always feel a little "nonsensical". What do those questions have to do with us? Who knows if the so-called answer is correct?

In feudal society, people gave these problems to God, to God, to heaven and earth. And when modern science has impacted the world, these problems have been turned over by human beings again. The questions are never-ending.

Even if we know the origin of the universe, the origin of life, then some people will still ask, why is this so, why is it not like that? Why are the rules of physics written this way and not that way?

In my opinion, our world is like "in Truman's world", the earth is a big vessel, and aliens try to imitate the evolution of life, like the first experimental subject, the first single-celled organism, and then he quickly grows, and finally in the present, it is controlled by humans. In fact, all the physical laws observed by human beings are nothing more than the external conditions that aliens have imposed on this instrument for us. So to ask the origin of life?

Then ask the aliens who created us. Maybe just tens of thousands of years ago, the fossils we saw and the history we speculated on were just a joke given to us by aliens. They are watching everything about us right now, controlling everything.

Original bai

When was the Earth born? According to the widely circulated opinion in the scientific community, the primitive Earth DAO was born about 50 million years after the formation of the Taihuiyang system. A: But a new view put forward by Jacobson, a scholar at Harvard University in the United States, is that the primitive earth was formed much earlier than that.

Scientists believe that the solar system evolved from a huge nebula, and the material in this nebula was gravitationally gathered into different clumps, the largest clump formed the sun, and the other larger clumps formed planets including the earth. It is believed that the primordial Earth was born when the mass of material that formed the Earth gathered 64% of the Earth's present mass.

Jacobson wrote in the American journal Science that they have conducted a new analysis of the process of the decay of hafnium isotopes into tungsten isotopes in the early days of the solar system, and revised scientists' original estimates to estimate that the original Earth was born within 10 million years of the formation of the solar system.

The solar system is thought to have been formed 4,56.7 billion years ago. Jacobson said in the article that in the next 10 million years, the primitive Earth had gathered 64% of the Earth's current mass, and at this time the Earth's "embryo" could be considered to have taken shape. The mark of the end of the process of the formation of the Earth was the birth of the Moon.

This event occurred about 30 million years after the formation of the solar system. Jacobson believes that the Moon may be the product of a collision between a Mars-sized object and the Earth.

Because the age of the earth at the time of formation is similar to the age of the solar system, "the stones of other mountains can be used to attack jade", scientists use a number of meteorites that fell on the earth and lunar rocks (soil) collected from the moon, after measurement, and combined with the age of the oldest rock on the earth, the age of the earth when it was formed can be deduced, which is about 4.6 billion years. For example, the age of the Jilin meteorite is 4.7 billion years old by rubidium-strontium method. The material that makes up the Jilin meteorite was separated from the Sun's primordial nebula 4.7 billion years ago, so it is a little older than the age of the Earth when it was formed.

At present, it is generally limited to 4.6 billion years, and the period since the beginning of the paleocravid in 4.6 billion years is the geological time of the earth, also known as the paleogeographic sphere period; The period 4.6 billion years ago is called the "astronomical period", also known as the "pre-geological period".