Do planets have to spare stars? Why?

There are three definitions of planets: 1. The mass is large enough to become a sphere. 2. Planets must revolve around one of their parent stars.

3. Its own gravitational force is strong enough to clear the orbit obstacles. Since the landlord wonders whether the planet must revolve around the star, the third condition is not considered here for the time being.

In the universe, there are many planets of the same size and mass as our common planets (that is, they are much more massive than asteroids, but not as good as stars). Although these objects have the size and mass of ordinary planets, because they do not orbit the stars, scientists have made a new definition of this special type of celestial bodies: planetary mass objects.

So this question is actually very easy to understand, for a celestial body with a planetary size (that is, it meets the requirements of condition 1), if it orbits a star (not around a planet, otherwise it is a satellite), it can be called a planet. If it does not orbit the star, it is called a planetary mass object.

Of course, there is still a third condition that needs to be taken into account in the actual classification. For example, Pluto has planetary mass and orbits the star (the Sun), but because it does not meet the third condition (that is, its gravitational pull is strong enough to clear the orbital obstacle), Pluto cannot be classified as a planet, but only as a dwarf planet.

A planet usually refers to a celestial body that does not emit light on its own and orbits a star. Its rotation is often in the same direction as that of the star it orbits [1]. Generally speaking, planets need to have a certain mass, and the mass of the planet must be large enough (relative to the Moon) to be nearly spherical, and it cannot undergo nuclear fusion reactions like stars.

That's the definition.

All the planets rotate and so do the stars.

The axis of rotation all crosses the center of mass of the celestial body. All moons, planets, stars, and galaxies revolve around their own axis The Earth's rotation is the circular motion of the Earth along an axis that passes through the Earth's center (the axis of rotation, also called the Earth's axis).

The time for the Earth's rotation is 23 hours, 56 minutes and 4 seconds; The moon rotates in the same time as it does around the earth, which is 27 days, 7 hours, 43 minutes and seconds. The angle between the Earth's axis of rotation and the ecliptic plane.

To put it simply, let's start with the universe. Matter (celestial bodies, meteorites), arrogant** gets kinetic energy, moves in the universe However, gravitational force makes stones form stars, and objects are in a state of no external force in space (not to mention gravity for the time being), so moving objects will not stop. And the gravitational pull stone hits the celestial body, other meteorites, and adds an external force, like you rub your hand against a soccer ball in water, forming a rotation.

As I mentioned earlier, celestial bodies and meteorites do not stop in space, but when gravity is added, there will be a force between the celestial bodies that will pull each other, and the meteorite in action will be changed by the gravitational force of the star, just like if you hold a shot put ball and rotate at an average speed. In fact, the revolution is pulled and pulled by the person (the mass is as large as a star, as small as a stone) will occur, but under the pull of the star and the stone, the mass of the star is larger than that of the stone, so the movement amplitude is smaller than that of the stone In fact, the revolution is rotated with each other --Nebula:

In fact, the gravel and ice in the gravitational orbit of the planet, and the rotation around the star are all the principle of revolution.

Gravitational forces make stones form stars" ?Stars are mostly made up of hydrogen! At the beginning of the universe, there was mainly hydrogen, heavy hydrogen, helium, etc., and there was no stone! Stone is a product of supernovae**

In general, stars have three different endings, namely the old red dwarf, the yellow dwarf that eventually becomes a white dwarf and the supernova explosion supergiant, in which the supernova explosion has two outcomes, one is a black hole and the other is a neutron star, but in fact, there are still two outcomes in the true sense, let's put it at the end, saying that the fate of a star is affected by its own mass, that is, the star itself determines what kind of ending it will become in the future.

This fate is predestined from the day it was born, only a few conditions will change, the red dwarf he is actually a small point in the star, that is, an entry-level star, its mass is less than 0 8 suns, and they do not change much during their lifetime, at least their mass does not change much, at the end of its life cycle, due to the loss of radiation pressure support, helium nucleus white dwarf can also be formed, but the mass will not be greatly abandoned, the yellow dwarf is actually the sun.

Its lifetime will not change much, in its later years it will become a red star, and finally, its shell will spread into a star-shaped cloud, and its core will lose radiation pressure support and collapse into a degraded carbon-oxygen white dwarf, which is a substance supported by electron-degrading forces, or there will be higher quality oxygen, neon and magnesium white dwarfs, but there will be no iron-core white dwarfs, because iron-core white dwarfs will develop to the next stage, carbon-oxygen white dwarfs will still have about 50 solar masses, and it will remain the anchor of the solar system, But the fact is that the orbits of other planets will rise.

Massive stars usually refer to stars that are more than 8 or 10 times larger. In the later stages, nuclear energy forms a degraded oxygen neon manganese core, but this is not the final result, in the future, it will continue to develop into a supernova, and the electron capture of the degraded oxygen neon manganese core will lead to the collapse of the inner core, forming a kind of supernova with dark II p, which will collapse into a neutron star if the core mass is less than the Oppenheimer limit.

The question of whether it is possible to convert between stars and planets and under what circumstances becomes stars is explained here today.

Stars are celestial bodies that have a certain degree of mass that can produce fusion reactions at key points, which in turn create kinetic energy. Planets, on the other hand, are small objects with masses below this limit and are tightly packed around stars. According to the theoretical definition, small celestial bodies that are adrift in the universe and do not orbit around stars are also considered planets.

The first difference between stars and planets is mass, and according to current calculations, the minimum mass of a star is times the mass of sunlight.

In other words, celestial bodies above this mass become stars, and those below this mass become planets. The only difference between a planet and a star is the structure. Stars are made of radon gas.

Massive radon clouds, subjected to sustained high temperatures and high voltages, produce nuclear reactions that release solar energy and heat. Eventually evolved into a star. Planets, on the other hand, are formed from overweight material elements.

This element includes heavy and inert elements as well as their precious metallic materials. Stars can use nuclear reactions to generate kinetic energy, but planets cannot. Because of the mass of the planet, it cannot reach the level of a nuclear reaction.

But in key parts of the planet, it may be possible to release power. That is the constant rotation of the planet, and the rotation pushes the strong underground elements of the star, which generates an electromagnetic field, like a region. There is a limit to the lifespan of stars, and the lifespan of planets is infinite.

Because the star will expand later, causing a supernova explosion and finally collapse into a super black hole, or it is inconvenient to transform into a white dwarf and finally burn up and become a black dwarf. But the planet is different, as long as it does not get other harm, it will exist in the galaxy for a long time, because it is not easy to ignite, not easy to expand, and less likely to happen**. Stars were not produced before the solar system.

That is, when the original silver core was first generated, the silver core was composed of exhaust gas and liquid with a density of thousands of times more than the normal density. Tens of thousands of times larger densities will inevitably expand, and the inertial force of expansion will cause the density to change from thousands of thousands of times larger to thousands of thousands of times smaller, and thousands of thousands of times smaller densities will inevitably cause convergence. So, if the stars and planets can be converted, then a certain mass must be around this boundary.

If a star with a small mass has damaged its mass, it is very likely that it has damaged its mass due to a collisionThen there is a good chance that the excess chemicals will become planets.

If a planet breaks into a huge, hydrogen-rich nebula, it may accretion of hydrogen, becoming heavier and heavier, and eventually triggering a core fusion reaction that will evolve into a star. There is only one possibility for a star to be transformed into a planet, and that is when the star dies a supernova**, throwing its outer material into space to form a nebula, and finally the nebula accretes under gravity to become a planet - strictly speaking, a part of the star may be transformed into a part of a planet.

In fact, it is a planet that can be converted into each other, and if it is relatively large and has other moons, then it can become a star.

Of course, they cannot be transferred to each other, after all, the energy of these two stars is completely different. If it is relatively high, then it is possible to convert.

Almost all celestial bodies in the solar system, including asteroids, rotate according to the law of the right-hand rule, and the rotation of all or most celestial bodies is also the right-hand rule. Why? The predecessor of the solar system was a dense cloud, driven by a certain force that attracted each other, and this accretion process made the density gradually larger, which accelerated the accretion process.

On the one hand, the centripetal accretion accumulation becomes the sun, and on the other hand, the gas gradually develops into a flattened shape, and in the process of development, the potential energy becomes kinetic energy, and finally the whole thing turns. At the beginning of the rotation, there are those who turn this way, and those who turn that way, after a certain direction prevails, they all become one direction, and this direction is the right-hand rule that is now discovered, and there may be other solar systems that are left-handed rules, but in our solar system it is the right-hand rule. The energy of the earth's rotation** is caused by the eventual transformation of material potential energy into kinetic energy, which ultimately means that the earth rotates on the one hand and rotates on the other.

As long as the observer or reference object does not rotate synchronously with the object as it is, then the object rotates. In addition, its power comes from a disguised blessing of gravity and dark energy (that is, dark energy blows the planets farther and farther away when the universe expands, and the kinetic energy provided by dark energy is calculated by me, which has not been confirmed so far, and the energy transmitted is pitifully small).

Stars also rotate, and that's how the sun is.

All stars rotate on their own axis.

As long as the planet revolves around a host star, then the planet will rotate. Although stars are gases, they are said to rotate on their own.

Movement is relative, to be precise, you say yes.

Let's start with what a star is? What is Planetary?

Stars are huge gaseous planets that rely on internal nuclear fusion reactions to generate light and heat. Its minimum mass is about 7% of the mass of the Sun. Less than this mass, its gravitational pull cannot make the internal temperature high enough to trigger a fusion reaction, it cannot emit light and heat, and it cannot be called a star.

A planet is defined as a celestial body that orbits a star stably. The mass of a planet must be much smaller than that of a star because a planet cannot shine on its own. In other words, the planet is not massive enough to initiate a nuclear fusion reaction inside.

Under the action of gravity, two planets orbit each other, called a pair of double stars. When a binary star runs, it revolves around a common center of mass. If the masses of the two planets are the same, then the common center of mass is at the midpoint of the central line of the two planets.

And if the masses of the two planets are not the same, the position of the center of mass will definitely be biased towards the more massive of the two stars. When the mass of one star in a pair of binary stars accounts for the absolute majority of the total mass, this common center of mass will even be inside the massive star. In this way, one massive star is basically immobile relative to the other, while the small massive star revolves around it.

In the solar system, the mass of the sun accounts for more than 98% of the total mass of the solar system, and the mass of the other eight large planets, plus all the dwarf planets, asteroids, comets, meteoroids and small interplanetary bodies, is less than 2% of the total mass of the solar system. In this case, it is impossible for the sun to revolve around the planets, only for the planets to revolve around the sun.

That is, the planets revolve around the stars, rather than the stars revolve around the planets, because the mass difference between them is too great.

What is a star. A star is a celestial body produced by plasma coming together, this plasma emits light and is spherical, and of all stars, the closest star to Earth is the Sun. At night, we can observe the stars with the naked eye, and the stars in the sky are stars, and the reason why they look so small is because they are so far away from the earth.

Stars are divided into constellations and stars, and within these constellations and stars, any star that is bright enough gets a name. Although we can see stars at night, it does not mean that we can see all the stars with the naked eye, such as stars outside the Milky Way galaxy where the Earth is located, we cannot observe them. <>

Stars mainly have several objects such as hydrogen, helium, etc. Stars have a lifespan, and inside a star there is a core, and the objects that make up the star are made up of any element heavier than the weight of helium. And when a star's life comes to an end, then it will have a lot of things that have degenerated.

Astronomers can look at the star's trajectory and their spectrum if they want to know the specific characteristics of the star, such as weight, age, and chemical composition. <>

What is Planetary? Stars emit light, but planets don't emit light and revolve around the star. As for the direction of rotation of the planets, it is generally related to the direction of rotation of the star, and it is usually the same direction.

Planets have a certain weight, but no matter how heavy the planet is, even if it becomes spherical, nuclear fusion cannot occur. <>

Originally, they were called planets because they moved around in an irregular position, just like people. The five planets that can be seen with the naked eye were first discovered a long, long time ago, because they did not know that the earth was also a planet at the beginning, and there was a geocentric theory. But later the development and progress of science and technology made people discover that the earth is actually a planet, so heliocentrism replaced geocentrism.

At the beginning, the definition of a planet is very simple, that is, you are not fixed in the sky and will run around, then you are a planet. But the current planets are not so simple to think, first you have to have a star for you to revolve around, and then you have to be as fat as a ball, and finally you have to be a hegemon on the track you are running on, that is, there can be no other celestial body bigger than you besides you.

Planets can turn into stars, but stars cannot turn into planets in reverse. If a planet wants to become a star, it needs to have a very large, very hydrogen-rich nebula, and then go in and absorb hydrogen gas, and finally nuclear fusion can become a star.