Can water know how long the earth can live?

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. Resources.

You can live for 5 billion years, and then you will be gone!

Hehe, don't worry so much! It's enough to live longer than you do, you say.

Categories: Education, Science, >> Science & Technology.

Analysis: There is a lot of water on Earth, and it is estimated that the total volume of water is about 13.8 billion cubic kilometers. If this water is evenly distributed on the earth's surface, it is equivalent to the earth's answer, and the entire surface is covered with a layer of water with an average depth of 2,650 meters.

Unfortunately, this water98 is saltwater, mainly found in the ocean. Fresh water only accounts for 2 of the total water of the earth, about 30 million cubic kilometers, and the fresh water of these 2 can not be all used by human beings, because its 88 is frozen in the ice caps and glaciers at the poles, and the remaining 12 that is, rivers, lakes and shallow groundwater that can be exploited can be used by human beings, and the vast majority of them are groundwater, which can not be applied without exploitation, and the water in rivers and lakes that can be directly applied only accounts for 0 04 of the total amount of fresh water. Water on Earth is always in flux, with water from the oceans and lands evaporating into the atmosphere, and then falling back to the earth as rain or snow, nourishing all things, replenishing rivers, lakes or flowing into the sea.

Water can also seep into the ground and sink into underground aquifers. Extremely deep groundwater cannot be replenished or extracted, and is known as primary water and therefore cannot be regenerated. As a result of this fluid nature of water resources, land-based floods or droughts have resulted in an uneven distribution of water resources, with about 65 of the world's water resources concentrated in 10 countries each year, while 80 countries with a combined population of 40 (9 of which are in the Near and Middle East) are experiencing severe water scarcity, and 26 countries (with a total population of 230 million people) have very little water resources.

We call these countries water-scarce countries. The international standard for water-scarce countries is based on the definition given by the Swedish writers Marin and Falkenmark: if a country has less than 1,700 tons of renewable freshwater** per person per year, then the country will be in a state of water shortage on a regular or frequent basis; If the amount of water per person per year is less than 1,000 tons, then there will be a shortage of water.

At present, there are 15 countries with an average annual water of less than 1,000 cubic meters per person. With only 82 cubic metres per capita per year, Malta has the highest water scarcity among these countries. In addition to Malta, the most water-scarce countries are Qatar (91 cubic metres per capita per year), Kuwait (95 cubic metres), Libya (111 cubic metres), Bahrain (162 cubic metres), Singapore (180 cubic metres), Barbados (192 cubic metres), Saudi Arabia** 249 cubic metres), Jordan (318 cubic metres), Yemen (346 cubic metres), Algeria (527 cubic metres), Burundi (594 cubic metres), Cape Verde (777 cubic metres), Oman (874 cubic meters), United Arab Emirates (902 cubic meters), Egypt (936 cubic meters).

Water is expected to be more expensive than oil in these countries by the middle of the 21st century, with Malta as per capita at 68 cubic metres per year.

Water doesn't go away. Water circulates in a water system. Instead of disappearing.

Less than 100 years.

But ......The ocean covers 71 of the Earth's surface, and if all the water in the ocean were evenly spread on the Earth's surface, a 2,700-meter-thick hydrosphere would form on the Earth's surface. So some people say that the name of the earth is wrong, and it should be called "water ball". From the origin of life on earth to the formation of human society, from a primitive society with low productivity to a modern society with advanced science and technology, man and water have formed an indissoluble bond.

Water is not only the basic condition for human survival, but also an indispensable material resource for social production. Without water, there would be no human society today. Water, air, and food are the three major elements of human life and health.

50 60 of the weight of the human body is made up of water, and the water in the body of a child is up to 80 . It can be said that there is no life without water. However, the earth's freshwater resources account for only 3% of the earth's total water resources, and of these 3 freshwater, only can be directly consumed.

Therefore, water is a precious resource for human beings and a fountain of life. Since ancient times, people have lived in pursuit of water and grass. About 5 billion years ago, on the primitive earth, the sky was like fire, and lightning thundered; Lava rolls on the ground and volcanoes erupt.

This natural phenomenon has become the "birth" of the origin of life. The huge heat energy prompts the primitive earth to move and change violently, giving birth to life. Due to the continuous heat dissipation of the primordial earth, the scorching surface gradually cooled down, and the water that originally "ran" from the earth to the sky condensed into raindrops, and then fell to the ground, which lasted for many hundreds of millions of years, forming the primordial ocean.

During the rainfall, hydrogen, carbon dioxide, ammonia and methane, etc., are partially carried into the pristine ocean; When the rain washes over the earth, many minerals and organic matter collect in the ocean. The vast desert primeval ocean, where all things meet, the weather is myriad, and a large amount of organic matter is continuously produced, and the ocean has become the cradle of life. Organism - amino acids.

At the same time, organic compounds can also be obtained by irradiation with ultraviolet light. In 1965, Chinese scientists were the first in the world to artificially synthesize insulin, a protein with vitality, which was a big step in China's journey to explore the origin of life. Due to the continuous heat dissipation, the scorching surface of the water gradually cooled down, and the water that originally "ran" from the earth to the sky condensed into raindrops, and then fell to the ground, which lasted for many hundreds of millions of years, forming the primordial ocean.

During the rainfall, hydrogen, carbon dioxide, ammonia and methane, etc., are partially carried into the pristine ocean; When the rain washes over the earth, many minerals and organic matter collect in the ocean. The vast desert primeval ocean, where all things meet, the weather is myriad, and a large amount of organic matter is continuously produced, and the ocean has become the cradle of life. Only in caring for the environment, the water on the earth can be recycled.

Without water on Earth, life on Earth would cease to exist.