Excuse me, scientists, how do you know that the sun has 7 billion years left?

It is temporarily impossible to calculate, and the former may be overthrown. Just like the radioactivity of matter, it has a half-life. In fact, the quantity is different, not a simple multiple proportional relationship. At a certain node, the sun is gray, and the transformation of matter and energy, time and space are also changing. In reality, we can't really understand relativity. Reality is relative and does not exist. Every time people look up at the starry sky, they are looking back at the past, talking to the past, and always seeing. Even longer ago, the answer was temporarily given to the universe and to the smarter descendants who will inherit our knowledge in the future. Recently, photos of black holes were released, and they racked their brains to find out when it was a black hole. I don't know how much dark matter, dark energy, gravity and repulsion are around us, and I don't understand. But I hope everyone can't figure it out and don't use their heads. Brain tonic will only come step by step. It is better to guess and think, and the reality will continue.

The life of the sun is actually when only he can shine. As we all know, the sun shines by radiation. Radiation is a stream of microscopic particles released by the nucleus in the process of changing from one structure or one energy state to another. But after the atom was irradiated, the nucleus changed into another form, and the radioactivity was greatly reduced, but the nucleus still existed. In other words, even if the sun doesn't shine, it still exists objectively. Can't simply use life to explain!

In order to calculate how much time the sun has left, we can first calculate the total life of the sun. Let's use a simple physical formula to estimate the total life of the sun.

The energy of the sun comes from the nuclear fusion reaction in the core area. The beginning of solar nuclear fusion is considered as the beginning, and the end of nuclear fusion is considered as the end. For most of the life of the sun, the nuclear fusion of hydrogen takes place in the core area, and four hydrogen nuclei are combined into a helium nucleus (mainly through proton-proton chain reaction). In this process, there will be 0.7% mass loss, which will be converted into energy according to the mass-energy equation of special relativity (E = MC 2).

According to the measurement, the energy released by the sun per second is 3.85×10.26 joules. According to the mass-energy equation, it can be calculated that there are 4.26 million tons of hydrogen nuclei undergoing mass-energy conversion every second, which means that 665.438+million tons of hydrogen nuclei are consumed every second.

Although the whole sun contains hydrogen, only the core hydrogen can produce nuclear fusion reaction. Due to the continuous nuclear fusion reaction of hydrogen in the core, the mass ratio of hydrogen is decreasing from an average of 75%. The closer to the core, the lower the proportion of hydrogen. The hydrogen mass ratio at the edge of the sun's core is about 70%, while the hydrogen mass ratio near the core is only 33%. It is estimated that the total mass of the sun is 2× 10 30 kg, and the total mass of hydrogen in the core of the sun is one tenth of the total mass of the sun, so the total mass of hydrogen capable of nuclear fusion reaction is about 2× 10 29 kg.

Assuming that the radiation power of the sun remains constant, the time required to completely consume the hydrogen in the solar core is 2×1029/(6.1×165438) seconds ≈ 3.28× 10 65448. If we consider that the actual nuclear fusion reaction rate of the sun will be faster and faster, then the actual life span of the sun should be shorter, estimated to be about 654.38+00 billion years.

In addition, through the evolution model of the main sequence star and the dating method based on radioactivity, the age of the oldest material in the solar system can be determined to be about 4.6 billion years. So the sun can last about 5.4 billion years in the main sequence star stage. After that, the sun will enter the red giant stage that lasts about 1 100 million years, during which helium nuclear fusion will be carried out. In other words, the life span of the sun is less than 7 billion years. Eventually, the outer layer of the sun will spread into space and become a planetary nebula, and the core will form a white dwarf under the gravitational collapse.

Even if scientists say that the life of the sun is 70 years, you probably won't see it.

Actually, not that much. According to the evolution of stars, the sun will begin to change dramatically in about one billion years. First, the red giant will expand. There is a saying that the outer photosphere will expand to Jupiter's current orbit. And then it will last for billions of years. In the final stage, the mass of the sun will only shrink into a white dwarf, and it will exist stably. The mass of the sun is not enough to form neutron stars and black holes.

Scientists speculate. Estimate, probably, maybe.

Which scientist worked it out? Ask him to answer when did the sun start? Why is the sky not as clear as before? How long will it take to see the blue sky?

Save some cows for the world, don't blow them all to death!

Some science is bullshit! But this fart is irrefutable! Because it's too long! Actually, this statement is not scientific! Just like a person, he will not live to 100 years old! There are fortune tellers according to your current age! And calculate when you will get sick! So there are some technologies! In fact, it is the same as the fortune teller cheating money! ! !

The life span of the whole sun is 7 billion years. At present, half the mass energy has been used. It is expected to burn for another 3 billion years, and then it will become a black hole.

Excuse me, which scientist has really verified that solar combustion is hydrogen nuclear fusion? Actually, it's still a guess Is it ridiculous to use conjecture to calculate the life of the sun?