There are eight planets in the solar system. Neptune is the outermost planet, and mercury is the closest planet to the sun. Some people may have heard the name of mercury and think that Mercury is a planet full of water. In fact, it’s not at all. Because Mercury is so close to the sun, the surface temperature is so high that there can’t be liquid water.
Mercury is the innermost and smallest of the eight major planets in the solar system, and it is also the closest planet to the sun. China, known as Chenxing, has the largest orbital eccentricity among the eight planets. It is an earth like planet, because it is very close to the sun, so it will only appear in the early morning, called Chenxing, or dusk as dusk. Unless there is an eclipse, mercury is usually invisible in the sun.
Some people may be more curious: Mercury is so close to the sun, why not be engulfed by the sun? In fact, the problem is not complicated. Although mercury is small, it is also a planet. While it rotates at a high speed, it also revolves around the sun. It is the force of rotation and revolution that reaches a balance, so that it will not be pulled by the sun and collide with the sun.
In fact, the same is true of planets. As long as they revolve around the sun, they will not hit the sun. NASA’s Parker solar probe, launched last year, will reach 690 kilometers when it is closest to the sun, and will not be swallowed by the sun at this distance, because it will revolve around the sun and become a satellite of the sun.
The mass of the sun is very large, and its strong gravity will attract all the celestial bodies in the solar system. But at the same time, the celestial body moves around the sun at a corresponding speed, so that it can avoid falling into the sun. Mercury moves around the sun at an average speed of 47.4 kilometers per second, so the sun’s gravity won’t pull mercury over.
The closer a celestial body is to the sun, the faster its orbit speed will be, so as to avoid falling into the sun. If a star is forced to stop its rotation and revolution, it will be pulled and swallowed by the sun once it gets close to the sun. In the recently popular science fiction movie wandering earth, scientists have installed tens of thousands of planetary engines on the earth to make the earth stop spinning and get out of its original orbit.
In this case, once the earth was captured by the gravity of the sun, it would be very dangerous. Later, the earth was captured by the gravity of Jupiter, almost hit Jupiter, and finally ignited Jupiter to escape. It can be seen that if the celestial bodies in the universe want to run stably and safely, there must be mutual balance of forces. Once this balance is broken, celestial body impact events will occur frequently.
Some people may have such a doubt: Mercury will not be swallowed by the sun, that is because Mercury is too small. What would happen if mercury were replaced by a celestial body like Jupiter? Will it be swallowed by the sun? The answer is No. Mercury can orbit the sun at a speed of 47.4 km / s, which has nothing to do with the mass of the planet itself, even with Jupiter.
Of course, there is also a prerequisite here, that is, the mass of planets is much less than that of the sun. Generally speaking, the mass of stars in a galaxy system accounts for more than 90% of the whole galaxy. In this case, even if all the celestial bodies form a large body, the mass of stars is very small. For example, in the solar system, the mass of the sun accounts for 99.86% of the total mass of the solar system.
If there are objects with the same mass as the sun close to the sun, things will be different. The collision between the two will probably happen. Therefore, in some binary and three-star systems, although there are many stars in common, they are far away, so as to maintain the gravitational balance. For a planet, being too close to the main star basically cuts off the possibility of life.
If an earth like planet like the earth is born in a very close orbit of a star, soon the water and atmosphere on the planet will be evaporated and become a hot purgatory planet. Scientists have also found such galaxies and planets in the galaxy through astronomical telescopes. The atmosphere and matter of the planets are evaporated, forming long tails behind the planets.
In fact, the orbit of mercury is not too close to the sun. If it is too close, the material on Mercury will be melted by high temperature, vaporized and dissipated into space, and finally the whole Mercury will disappear.
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