I heard that the sun can live for 5 billion years

What is happening inside the sun is nuclear fusion.

The primordial heat of the sun is due to its internal pressure. According to the principle of the law of gravitation, the greater the mass of an object, the greater its gravitational pull. In the early years, when the sun snowballed, as the mass increased, the gravitational pull became stronger, the more material it attracted around it, the more mass was increased, and so on, the mass of the sun became larger and larger.

At the same time, the greater the mass, the greater the internal pressure, so that the temperature continues to rise. Thermonuclear fusion occurs under sufficient pressure (called critical pressure) and a suitable ignition temperature. As the mass of the primordial sun continues to increase, the internal pressure and temperature rise, and after the conditions for thermonuclear reactions are met, the sun begins to shine and become a star.

Generally speaking, for a gas planet to become a star, it must have a certain mass, so that the pressure and temperature inside it can meet the conditions for a thermonuclear reaction, and this mass is called critical mass. A typical example is Jupiter, the largest gaseous planet in our solar system, which is also a gaseous planet composed of hydrogen, but because its mass is less than the critical mass, the internal pressure and temperature cannot meet the conditions for thermonuclear fusion, so it can only be a gaseous planet. However, it is a potential sun, and some scientists speculate that after the destruction of the sun in the future, Jupiter, which is not constrained by the sun, will attract the surrounding planets to form a small solar system by virtue of its position as the leader of the solar system, and at the same time continue to absorb the surrounding matter to increase its mass, and after reaching a critical mass, it will shine and become another sun, but that will be 5 billion years later.

The time you said is very long, and we definitely won't live to that time, so think of something realistic, and if you are interested in this area, you can also read more books, which will help a little.

That's right. Solar fusion can only last for 5 billion years...

Inaccurately, it is that there are still 5 billion years in the main order. After that, it will turn into a red giant and destroy the Earth.

Yes, but before that the Earth didn't exist

That's right, but please don't use the word "straight energy".

Please use "okay" to describe it.

Isn't 5 billion years long enough? For you, the sun can live for 10,000 years, hehe.

For human beings on Earth, the sun is so important that there is no celestial body in the universe that can compare to the sun. In the final analysis, the survival and development of human beings depend on the energy sent by the sun. However, only one-2.2 billion of the sun's light and heat is given to the earth, and the rest is scattered into the sky.

But just one in 2.2 billion is enough to make the earth such a vibrant and thriving world.

Where does such a huge amount of energy come from the sun? What is this blazing fireball burning?

It burns not firewood, nor coal, but hydrogen. In scientific terms, the sun's energy is produced by a reaction in which every four hydrogen nuclei are combined into one helium nucleus.

This is called a thermonuclear reaction. The energy emitted by a thermonuclear reaction is huge! When a gram of hydrogen turns into helium, the energy released is equivalent to burning fifteen tons of gasoline.

One kilogram of hydrogen is worth hundreds of truckloads of coal. You know the hydrogen bomb, it is more powerful than the atomic bomb, and it is this thermonuclear reaction that occurs during the hydrogen bomb.

In the sun, the "hydrogen bomb" has been going on non-stop for about five billion years. Now the hydrogen on the sun, if it continues like this, it will be enough for another five billion years.

After these five billion years, all the hydrogen has been used up and turned into helium. The sun wasn't what it is now. It will begin to expand all the way up to the outside of the circle where the Earth is now revolving.

We know that the closest planet to the Sun is Mercury, the second is Venus, and the third is Earth. This means that the sun will open its mouth and swallow Mercury, Venus, the earth, and the moon one by one. At that time, the temperature on the surface of the sun would be lower than it is now, and the color would be red.

Astronomers have given this large, red star a name called a red giant.

Of course, we don't have to worry about the destruction of the Earth in five billion years. Perhaps, humanity was destroyed before that. Or maybe the humans on Earth have already migrated to another planet to rebuild their homes.

Do they have what it takes to do so? We don't know. However, judging from the current pace of scientific and technological development in the world, it should be possible for them to have this ability.

What will happen to the Sun in 5 billion years?

Turn; The age of the Sun is about 4.6 billion years, and it can continue to burn for about 5 billion years. In the final stages of its existence, the helium in the Sun will be transformed into a heavy element, and the Sun's volume will begin to expand until it engulfs the Earth. After a 100 million year red giant phase, the Sun will suddenly collapse into a white dwarf - the final stage of all star existence.

After a few more trillions of years, it will finally cool down completely.

How many more years can the sun exist? Scientists are: the age of the sun is about 4.5 billion years.

During this time, it will consume half of the hydrogen in the sun's core. In other words, these "fuels" are enough for the sun to burn for 4 billion 5 billion years. With such a long number of years, people can rest easy.

Not so long ago, however, the Dutch astrophysicist Van Jär Mayer made a surprising statement. Based on data on changes in the temperature of the Sun's nucleus in recent years, he came to the astonishing conclusion that the Sun is now undergoing everything that happened before a supernova**.

According to Wan-Jell Mayer, the temperature of the sun's core is usually 27 million degrees Fahrenheit, but in recent years it has risen to 49 million degrees. If the solar nucleus continues to heat up at this rate, and this process is irreversible, then the sun will inevitably ** after about 6 years. If you want to understand the consequences of the Sun, you can observe the changes of a planet very close to the supernova that has passed.

Image presentation of the Siberian branch of the Institute of Solar and Geophysics: About 8 minutes after the supernova**, the entire starry sky was submerged in a huge and terrifying flare. It can be seen that with the dazzling light emitted by **, the invisible X-rays, ultraviolet rays, and radiation that come together are so powerful that they break through the protective layer of the atmosphere and kill all living things in an instant.

The radiant energy heats the atmosphere and the surface of the planet to several thousand degrees at once. Seawater began to evaporate in large quantities. The planet is shrouded in scorching gas.

Through the thick fog, a sphere that gradually grew larger was shining, and the night sky was red and purple, and the pattern was terrifying. The red-hot cloud of ionized gas gradually obscured the entire sky at a speed of several thousand kilometers per second. The reddish magma erupted from the supernova** rolled in with lightning speed, and soon reached the very close planet, bringing a devastating disaster.

Imagine that the history of the planet Sun**, the inhabited Earth, will also come to an end. It took a long time for the radioactive molten ash on the silent planet to slowly cool down.