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The landlord tried to tie a small round ball with a rope, hold one end with his hand, and throw it outward, what do you see? Did the ball fly out? If it flies out. That's when your rope breaks, or if your hands aren't strong enough.
If he hadn't flown out, would he have circled around your hand around the rope? When the diameter of the star reaches a certain limit, and its gravitational force is greater than the escape force of the matter on the star, the material on the star will not fly into outer space, then the matter can only circle around the star, and over time, the star will become like a ball.
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I don't know if the landlord has seen the asteroids, most of the asteroids are like potatoes, showing strange shapes, but the relatively large asteroids are an approximate sphere. Is there a pattern to this?
Yes, the landlord should know that gravity is a celestial body, for a celestial body with a large enough mass, gravity can overcome the rigid physical force on the surface of the celestial body and make the celestial body present an approximate sphere. That's why smaller asteroids come in various shapes, but larger asteroids are approximate spheres.
Returning to the landlord's question, as long as a celestial body has enough mass, then it must be an approximate sphere, and the greater the mass, the closer it is to the sphere. But this is not the case with small celestial bodies, which have no gravitational pull to overcome the rigid physical force on the surface and take on all sorts of strange shapes.
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Not necessarily, why, ask Albert Einstein.
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The reason why the planet is round is because the force of the gravitational field originates from the center of the star, pulling all the matter inward; The massive body of the planet, combined with the heat generated by the radioactive elements inside, behaves like a liquid, succumbing to the gravitational pull from the center of gravity for a long time, thus forming a circle.
But not all planets are round. For smaller stars, such as asteroids, the gravitational force is too small to exceed the force of its own structure. As a result, these stars retain their irregular and incomplete shapes, rather than forming spherical shapes, because the planets are rotating, and because of the centrifugal force, the planets become a shape that is stable on all sides.
In three-dimensional space, only spheres match, so they are spheres. All.
Liu Qingzhi 2019-02-23140
Liquids naturally shrink into spherical shapes under their gravitational pull under weightlessness, and the same is true for planets.
Inner Struggle2019-02-23180
The planets should be elliptical, and they are all slightly elliptical, not round, probably because of the effect of gravity.
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If you've ever looked at the ** of our planets, or looked at them in a row, you've noticed something interesting – all planets are round. Naturally, you might ask, "Why are planets round?"
The answer to this question lies in the two questions of how planets form and how gravity works.
When rocks, atmosphere, and dust begin to meet in the universe, some of them begin to stick together or clump together. When all these rocks, dust, and atmosphere gather, they create their own gravitational pull that will bring all of this together. The planets that are forming are very hot, even lava.
Then gravity starts acting on these hot and molten substances. The gravitational force is the same in all directions. Because the gravitational pull is emitted from the center of these substances, these outer layers of matter are pulled towards the center in the same way, and eventually they form a spherical shape.
As the massive, extremely heavy mass begins to crash towards the center, the melted mass and pressure begin to push outward. The inward gravitational force and the outward pressure create an equilibrium. This balance is made and maintains the shape of a sphere.
After these substances have cooled, it still retains its spherical shape. That's why our planet is round. However, they are not strictly spheres.
As the planets rotate, there will be some bumps in their circles. The faster the planet rotates, the bigger the bulge. This means that a planet that spins rapidly may not be as round as the others, and may even be a little flat.
In addition to this, some objects also affect the planets, forming impact craters in the representation of the planets.
For comparison, you can look at asteroids. Smaller planets tend to be round. In fact, they are jagged, fragmented, or other irregular shapes.
This is because smaller asteroids have only a very weak gravitational pull, which means that they do not attract matter in the same way in all directions.
The planets are round because the center of gravity attracts all the matter with the same gravitational pull. But not all planets are exactly spherical. They are not perfect in shape and surface, but they generally maintain their round spherical shape.
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The solar system and the Milky Way are subordinate. The solar system is a collection of all celestial bodies centered on the Sun and subject to the Sun's gravitational pull. The Milky Way is the galaxy where the solar system is located and belongs to the barred spiral galaxy.
The Milky Way is oblate in shape because this is the only way to maintain the dynamic equilibrium of the Milky Way. In fact, there is a huge black hole at the center of the Milky Way.
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The most different thing about point 1 is that the direction of the whole galaxy is different, and the difference between the solar system and the Milky Way in point 2 is that the direction and orientation of the whole galaxy are different, the Milky Way is flattened, and its shape is not very good.
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The affiliation is different, the galaxy is different, the stars are different, the star clusters are different, and the constraints are different. This is due to the oblate and circular state, which can maintain the dynamic equilibrium of the Milky Way and maintain the normal operation of the Milky Way.
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How is the solar system different from the Milky Way? Why is the Milky Way flat and not round? The Milky Way is a huge system of celestial bodies containing thousands of galaxies, and the Solar System is an ordinary galaxy at the edge of the Milky Way.
At its primitive, there were many planets in the Milky Way, and they were shapeless planets, and there was no periodicity, and each planet was like dust。As a general definition, under the influence of the starry sky, the mass of matter converges towards the core. However, because of the centripetal force generated during the rotation, this kind of convergence was intercepted.
Subsequently, when the direction of the centripetal force is perpendicular to the rotation of the surface, there is no centripetal force that will block the convergence, and due to the emergence of the centripetal force, when the convergence reaches a certain level, this will be terminated, and the convergence will eventually be formed. Very flat hard drives, so the Milky Way became what we see now.
The flatness of the Milky Way may be due to the Milky Way's core, or it may be swallowed up by chemicals in some other direction。Otherwise, because there are so many planets out there, there's a good chance they've been walking around on the plane. As a result, only the center of the Milky Way rotates, and the Earth's equator emits some unknown chemicals or kinetic energy to keep the Milky Way flat.
Why the Milky Way is flat, we should discuss the spatial perspective and forces from two aspects. We all know that the middle star is very massive, and therefore very attractive. In conclusion, the surrounding space inevitably has a certain deformation.
As a result, the objects attracted to it cannot fall directly to the core. Okay, because of this cause of rotation. Subsequently, the force causes an object to agglomerate, the distortion of the region causes rotation, and the inertial force of the star or the centripetal force of the planet, i.e., the force of action, only forms a sphere.
There is a huge super-black hole at the center of the galaxy, and its attraction is focused on devouring the planet as if it were a pool of water. The amount of current will be funnel-shaped, but since the attraction point of the planet is located in the core, it is not a Brinell funnel, but an oblate shape. So that's the only way to keep the galaxy in a stable balance.
We all know that under the influence of attraction, the denser chemicals of the orbit will become larger, and then after reaching a certain point in this way, the particles of the large star cluster will be located at the corner point under the influence of the momentum moment, which will move around the center of shape, so that there will be a planar map, that is, the plane of rotation of the air cloud, but there will be a lot of particles moving from side to side. As a result, the Milky Way forms the flat shape that everyone sees.
Nobody knows. Space is called space because people used to see places outside the earth that were dark and empty, so they were called space. To put it bluntly, it's a word. >>>More
This is the orbit of the star at the center of the Milky Way, and the red color is the gas cloud, and the observations of the past two years show that the gas cloud is rotating around a point. By working with these persistent orbits to calculate the position of the central black hole, which is not a black hole, it is a huge object with an invisible mass, and the mass of the central black hole can be deduced from the mass of about 4 million suns based on the radius, velocity, and mass of the star around which it orbits. So it's basically determined that the center of the Milky Way is a supermassive black hole. >>>More
Because of gravity.
At the most primitive time, there were many galaxies in the Milky Way, and they were all galaxies without shape and state, and without regularity, each galaxy was like dust。As a general concept, under the action of the Milky Way, the mass of matter shrinks towards the center. However, this contraction is prevented due to the centrifugal force generated during the rotation. >>>More
The stars we see at night are part of the Milky Way, but they occupy only a very small area of the Milky Way. >>>More
Through the results of space telescope and radio antenna array observations, the boundaries of the Milky Way are roughly demarcated, so that an image of the Milky Way is drawn, and then the diameter of the Milky Way is calculated, and the result is currently thought to be about 150,000 light-years (mainly the boundaries of the Milky Way are disputed). >>>More