According to reports, Wang Jiyang, an academician of the Chinese Academy of Sciences, said:
With 4.5 billion years to go, don't worry about development drying up quickly. Not only that, the earth is also like a charging treasure, which can be used as a "power supply" to output geothermal energy to the outside world, and can also store energy like a "battery" for later use. Geothermal energy can be used for agriculture, power generation, and heating the South. Netizens said: "Earth brand" charging treasure, another 4.5 billion years.
It can be said that the life span of the earth is quite long, but this does not mean that humans can always live on the earth, in fact, scientists have long found that in another 100 million years, the earth will no longer be suitable for human habitation.
So the question is, why does the Earth live so long? Why is there only 100 million years left for humanity.
A lifetime on Earth
We all know that Earth is one of the eight planets of the Solar System, 150 million kilometers away from the Sun. The planets in the solar system from the inside out are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
The first four planets are solid planets and the last four are gaseous planets. It is said that 4.6 billion years ago, in the position of the current solar system, there is a molecular cloud of up to 2 light years long, for some reason, resulting in the gravitational balance being broken, this molecular cloud under the action of gravity, began to converge to the center, forming a sphere, due to the gravitational potential energy of the particles in the molecular cloud into internal energy, resulting in a sharp increase in temperature, the formation of an early star embryo, further evolved into a star, that is, the sun.
In the process of forming the sun, there will also be some debris debris, which are in different orbits, relying on gravity to form celestial bodies, including various planets. And the process is also similar to the formation of the Sun, the gravitational potential energy of molecular clouds will be converted into internal energy, making their core temperature very high. The Earth probably formed shortly after the birth of the solar system, in the interval between 4.5 and 4.6 billion years ago.
The temperature at the time of the Formation of the Earth was very high, and it was exactly a fireball. It didn't become a star because it wasn't massive enough to spawn a fusion reaction.
After the formation of the earth, in the following years, the temperature began to drop continuously, forming a solid crust, which covered the surface of the earth like a quilt, and under the earth's crust, was the mantle and core, the temperature was very high, but due to the existence of the crust, the energy of the mantle and the core of the earth was not released quickly, on the contrary, they were released very slowly.
Nearly 4.6 billion years after the birth of the Earth, the depletion of these energies is almost negligible.
The earth's energy is mainly dependent on the energy radiated by the sun. If the power of the sun is compared to money, then the sun throws 70 trillion dollars into the universe per unit time, and the energy reaching the earth is about 30,000 pieces, and the energy used by humans is about 3 pieces.
Let us not forget that there is still a lot of energy in the earth's interior, and a considerable part of the sun's energy will be fixed in the biosphere through photosynthesis, enter the ecological chain, feed a large number of earth creatures, and they will be buried underground for storage after death. Therefore, when studying the earth, scientists mention that "three deeps" refer to deep sea, deep space, and deep earth, in which deep sea and deep ground contain a lot of energy.
In a way, the earth is not only full of energy on its own, but also constantly being charged by the sun, and it is now in its prime. If human beings can be good at developing these energy sources, they don't need to worry about the energy crisis at all.
Especially geothermal, some people have estimated that even if the earth is at the end of life, human beings will not be able to use up these geothermal resources. So what does the end of the earth look like?
It starts with the sun. The Sun is a yellow dwarf, the main sequence star period is about 10 billion years ago, the so-called main sequence star period refers to the stage that can be steadily and continuously radiated outward energy. When the solar main sequence star period ends, the hydrogen element in the sun's core will be burned out, at this time it needs to start converting to burning helium element, there will be a time to shift gears, the sun at this time will expand, according to current estimates, the sun's atmosphere will flood the earth, and the earth may go to the end of life. So the time left for Earth is between 4 billion and 5 billion years.
So, supposedly, human beings should be able to live until the destruction of the earth, so why only 100 million years?
The earth is warming
Humanity is now plagued by the problem of global warming, and according to scientists' estimates, if the temperature rises between 1.5 degrees and 2 degrees, humanity will suffer heavy losses. But what we need to know is that all the efforts we make are to change the temperature of the earth on a small scale, but from a large scale, the warming of the earth is inevitable. Why?
We all know that the energy of the earth comes mainly from solar radiation. Solar radiation, on the other hand, relies on nuclear fusion reactions in the sun's core. The main process is: 4 hydrogen nuclei through the nuclear fusion reaction to generate 1 helium nucleus, in this process will release a large amount of energy outward, but because the sun's own gravity is very strong, the nuclear fusion is bound to the position of the sun's core, but also to ensure that the nuclear fusion reaction will not be too intense, gravity and nuclear fusion pressure generated by the external pressure to form a dynamic balance.
But what we need to know is that the greater the mass, the greater the gravitational pull, and due to the nuclear fusion reaction, the sun has 4.2 million tons of mass to be converted into energy to release every second, which leads to a large mass loss. With the passage of time, gravity will become smaller and smaller, the ability to bind nuclear fusion reactions will decrease, nuclear fusion reactions will become more and more intense, more and more energy will be released, and the solar radiation received by the earth will increase.
Scientists have calculated that in 1 billion years, the earth will be too hot to fit any living creatures, and the earth will become a desert.
Of course, 1 billion years is still too long for human beings. But in reality, the time that nature has left for humans is not at all 1 billion years.
Scientists have found that due to the continuous increase in temperature, after 500 million years, the earth's temperature is enough to make plants unable to survive, and at that time, the plant-based food chain will collapse, and humans need to rely on this food chain to survive, so it is actually difficult for humans to survive this threshold 500 million years later.
It is estimated that many people will feel that 500 million years and 1 billion years are actually not much different, and they are too long for human beings. But in fact, 100 million years later, there is another threshold, and that is that the Milky Way will merge with the Sagittarius dwarf ellipsoidal galaxy.
The relationship between galaxies in the universe is like a snake game, the big eat the small, the more you eat, the bigger the milky way, the future will merge the Sagittarius dwarf ellipsoid galaxy. Scientists have found that every time a galaxy merge occurs, there are extreme climates on Earth, leading to mass extinction events.
Therefore, if human beings still exist 100 million years later, they will definitely encounter this huge challenge, and it is difficult to say whether they can cross it. Not to mention, this 100 million years is also full of hardships, large-scale nuclear war, large-scale biochemical warfare, climate changes, asteroid impact on the earth and other reasons may lead to human extinction.