The biggest planet is bigger than a star, but it still can't get rid of the star's gravity. Why?

Introduction: It is a common sense that the planet we live in is the Earth and the star system in which the Earth is located is the solar system. In the solar system, the planet with the largest volume and mass is Jupiter, but for the sun, the mass and volume of Jupiter is only nine Niu Yi hairs, even one thousandth of that of the sun.

The universe is so magnificent, even if our scientific and technological level is very advanced, in front of the vast universe, it is really not even comparable to a dust. The solar system is just a very common small galaxy in the hundreds of millions of stars system of the Milky Way, and the Milky Way is just the tip of the iceberg of the universe. However, even so, in the 1980s, we humans launched Voyager 1 in order to rush out of the solar system and explore the cosmic environment outside the solar system. However, after 40 years of flight, the current position of Voyager 1 has not crossed the real solar system boundary. And according to the design life of Voyager 1, it will be retired soon.

In the solar system, there were originally nine planets. After 20 15, the international astronomical organization thinks that Pluto, ranked ninth, is too small in size and mass to meet the definition of planetary division. Therefore, it was announced at the meeting that Pluto is no longer a planet in the solar system. The planets in the solar system are only Mercury, Venus, Earth, Mars, Saturn, Jupiter, Uranus and Neptune as we know them at present. Among the eight planets, Jupiter has the largest volume and mass. In the solar system, the sun is the only star. Although we see in some pictures of the solar system, the sun is about the size of Jupiter. But in fact, Jupiter's mass is only about one thousandth of that of the sun.

Since there are almost countless galaxies in the universe, is there a galaxy in the universe, and the planets orbiting the stars are bigger than the stars? There are two situations here. If it is relative mass, then the mass of the star must be greater than the mass. Because according to Newton's law of universal gravitation, the gravitation between celestial bodies is related to their own weight and the distance between them. But in fact, the action of force is mutual. So the gravity of the earth to the sun is the same as that of the sun to the earth. These two * * * together constitute a binary system. It's just that the mass of the sun is much larger than that of the earth, so the earth will be far away from the sun, and the sun will only be almost negligible.

Secondly, there is a basic feature of stars, that is, the inner core can spontaneously carry out nuclear fusion reactions. The basic reason of nuclear fusion reaction is that lighter atoms, such as the lightest hydrogen element in the periodic table, break the bonds between atoms at extremely high temperature and pressure and fuse into heavier atoms. Although the nuclear fusion reaction seems that the atomic mass becomes larger, in fact, the mass is lost before and after the reaction. According to Einstein's equation of mass and energy, the lost mass will release huge energy. This is why the sun is far away from us, but we can feel the warmth of the sun. However, a small mass celestial body cannot spontaneously carry out nuclear fusion reaction.

On the other hand, it is a fact that larger planets orbit smaller stars. There is a red dwarf star, numbered 2MASS J05233822- 1403022, whose mass is only 9% of that of the sun, equivalent to 90 Jupiter. However, due to the collapse of the star in the later stage, its size is only equivalent to a Jupiter.

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