Jupiter and the sun formed almost at the same time. Why didn’t they become stars in the end?

The solar system is the eldest of the sun and a star, while Jupiter is the largest planet in the solar system and the eldest of the planetary family. Scientists have found that Jupiter and the sun form almost at the same time, but why didn’t Jupiter become a star in the end? What happened then?

To uncover the failure of Jupiter’s transition to a star, we need to go back to the early days of the solar system, starting from the time when the sun was just formed. The sun was born about 4.9 billion years ago, when this part of the solar system was a primitive nebula, called the solar nebula. At this time, there is no sun, but at the center of the nebula, the matter is dense. At this time, the matter is constantly converging to form an early small celestial body.

With its increasing mass, one day when its mass reaches 80 times that of Jupiter, hydrogen fusion finally begins to take place in its inner center, and the fusion of the star’s core is ignited, and it begins to transform into a star. When the sun was just formed, it was surrounded by innumerable kinds of stars, large and small, and the number was too large to be estimated. Among them are eight planets, including Jupiter and earth.


Since the sun was first formed, its mass is also the largest. As its mass becomes larger and larger, it can attract more and more celestial bodies and materials. Therefore, when it was still in the early stage of the solar system, most of the material in the solar system was absorbed by it and grew stronger. Finally, 99.86% of the material in the solar system was absorbed by the sun, and it finally evolved into the present sun Scale, become a real star.

Jupiter’s late formation, but it is such a time difference, but let Jupiter no stars. The original orbit of Jupiter was not so far out as it is now, but very close to the sun. Jupiter’s mass was second only to the sun at that time. If it wasn’t for the continuous impact of celestial bodies, which gradually deviated Jupiter from the center of the sun, another star might form behind, and the solar system would become a binary system.

Unfortunately, in the early days of the sun’s formation, the solar system was very turbulent, especially in the center, where there were dense materials and numerous celestial bodies. The sun was formed earlier, and its mass has reached a certain scale, so it is not afraid of the impact of these small bodies. But at that time, Jupiter was not as big as it is now, it was just a small celestial body. After being hit farther away from the sun by other celestial bodies, it is very difficult for it to become a star.


The reason is that the farther away from the center of the solar nebula at that time, the less material and the less celestial bodies. At this time, Jupiter can’t absorb more objects, it can’t continue to grow, and its mass can’t be greatly improved. Without the advantage of mass, there is no way for the internal fusion of Jupiter to make it a star.

Therefore, Jupiter has become a “failed star”. Although the transformation of Jupiter to a star has failed, because it was born near the center of the solar nebula, it still absorbs a lot of matter by its own gravity, and its mass is far ahead of other celestial bodies. In this way, when Jupiter is hit far away by celestial bodies, it continues to absorb the surrounding material, and gradually grows, and finally becomes a gas giant planet and the leader of the planet.

So from the law of the birth of celestial bodies in the universe, it is very important to be born earlier than later. Celestial bodies have inherent advantages, which can take a step ahead and constantly collide with other celestial bodies to strengthen themselves. In addition to the sun, the formation process of the other eight planets is similar. They are all formed by continuous impact and fusion. In the 200 million years before and after the formation of the earth, the eight major planets have basically been formed, and even some dwarf planets and asteroids have been formed. At this time, the solar system has begun to take shape in scale, framework and operation mode.


The formation of Saturn is similar to that of Jupiter, and its orbit was close to the sun. The reason why Saturn ran to its present position may also be caused by the constant impact of celestial bodies. Because the edge of the solar system is far away from the sun, the material here is sparse, so all kinds of celestial bodies formed are very small, most of them exist as asteroids.

Some people may think that the impact of celestial bodies can impact Jupiter to such a remote location is also very incredible. In fact, the power and effect of celestial body impact is beyond our imagination. For example, the moon, the satellite of the earth, may be formed by impact. Shortly after the formation of the earth, an object the size of Mars collided with the material splashed out of the earth at a relatively inclined angle, forming a planetary ring around the earth. Later, the planetary rings merged into a planet, forming the present moon.

In the universe, galaxies like the solar system have similar formation mechanisms. When we understand the formation process of the solar system, we can also understand the formation process of other galaxies. In the solar system, the mass of the sun accounts for 99.86% of the total mass, so the mass of other stellar systems is almost as much as that of the total mass of the stellar system.


The larger the mass of the star in the galaxy, the stronger the contribution to the stability of the galaxy. In a galaxy like the solar system, the mass of the sun is enough to hold the orbits of other planets tightly, allowing them to move safely and steadily around. If the mass of the star is not high in the galaxy, then the stability of the galaxy will be much worse. Without a stable and safe galactic environment, it is basically impossible for a planet to give birth to life or even intelligent life.

Therefore, when scientists are exploring the universe, looking for extraterrestrial life and alien civilization, they attach great importance to the mass of stars, and see how the mass proportion of stars in the whole system is. If the proportion is very high, reaching the level of the sun, the galaxy is a stable star system, and in a stable galaxy, if Earth like planets similar to the earth are found again, it will be a stable star system The probability of the existence of life will naturally be much greater.

Guys, what do you think of this? Welcome to leave a message below to discuss and express your opinions.


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