How big is the solar system? This is a question that most people don’t have any concepts. In the world we live in, gravity is extremely weak, so it is difficult to show gravity even if two objects are very close.
The first time humans successfully measured the gravitational constant was the 1789 experimental physics genius Cavendy's twist scale experiment. He used a genius design - the extremely slender hanging silk to turn the extremely weak gravity into a slight twist, and then used a reflective mirror to turn this twist into a value on the scale.
So it's hard for us to imagine what gravity a tennis ball can have. But in the universe, this ratio is not the case. The distance between celestial bodies is surprisingly large. Gravity has undergone qualitative changes under quantitative change and becomes very powerful. For example, the solar system we always think we are very familiar with, but in fact, ordinary people do not know more about it than a bird outside the window.
The distance between celestial bodies
First ask yourself, does the solar system you understand look like this? The sun is in the middle, and the planets are almost the same, and they are closely revolving around? Then you have been misled. This is just an ideal model. In order to put them in a graph, if the real solar system is really placed in a graph, we will definitely be very surprised - what about the planets? Where have the planets gone? Because the sun accounts for 99.86% of the total mass of the solar system, the "eight planets" are actually just dust.
If the earth shrinks to as big as a tennis ball, then the moon is probably as big as a cherry. So imagine holding these two balls with your hands and gauging the distance between them. What is the approximate one? A palm distance? Or the distance between one arm?
is not, the answer is 2 meters away! The hands of normal height people cannot catch them at the same time, because the wingspan is about the same height. The distance between this middle can be arranged calmly. All the other seven planets can even be stuffed into one Pluto ...
So at such a ratio, how big is the sun? The diameter is about 7 meters, and the width of most of the street is indeed very huge compared to the planet!
OK, we already know how huge the sun is, how far is it from the sun to the earth? Direct data shows that the distance between the earth and the moon is about 400,000 kilometers, and the distance between the earth and the sun is about 15,200 kilometers. The ratio just now is 844 meters, which is equivalent to a standard stadium running for more than two laps. From this distance, the diameter of the sun is also insignificant.
is the Earth or a planet closer to the Sun. So how far is the planet farthest from the Sun - Neptune , about this ratio? 22,480 meters (22,480 meters), 22 kilometers! Generally, third-tier cities are only so far through the entire urban area. Note that this is just a radius. If you spread it and cover it, the area is four times that of a standard nuclear bomb’s effective killing area!
Where is the final boundary of the solar system
Is this the boundary of the solar system? Humph~~~
is still far from it? Beyond Neptune, there is a small celestial area full of frozen small rocks called Kuiper belt , which has a much larger area than the area within Neptune!
So where is the boundary? The detector of Voyager One gives us the answer. When the plasma concentration in the universe suddenly increases, it is when the sun's "sphere of influence" is exhausted, so how far is this? It is still reduced according to the previous scale, which is about 101,200 meters (101,200 meters) and 100 kilometers! The area it covers is 34,500 square kilometers equivalent to the entire Hainan Island!
A ball with a diameter of 7 meters can effectively cover more than one province. The power of gravity in the universe cannot be underestimated!
The solar system is also moving around the center of the Milky Way. The suddenly increased plasma is matter dispersed in the universe. The solar system is like a huge comet, dragging its long tail and flying forward forever.
The lonely brave man - Voyager 2
November 5, 2018, the Voyager 2 detector, which has the highest cost-effectiveness and most work in history, left the boundary of the solar system and officially entered the deep universe (it is actually inaccurate. Its location is 16 hours a time difference from the earth. Too far away has made the difference in time and space not negligible, so it should be that humans received the signal that it had left the solar system on November 19).
This journey has been going on for 41 years. On August 20, 1977, it took off at the Kennedy Space Launch Center and used Titan as a gravitational slingshot to become the first artificial equipment to close the shooting of Uranus and Neptune. Voyager II uses nuclear fuel plutonium batteries that can last for 5 billion years to power, and can work until the day the sun goes out, floating forever in this endless and open universe.
Imagine a speck of dust on a tennis ball, broke free from the shackles of gravity under the small flame, flew for 40 years, and finally crossed a very long distance of 100 kilometers, broke away from the sphere of influence of the solar power of Hainan Island, and became a dust flying around the center of the Milky Way, sitting on the same level as the solar system...
, it is a great road that shocks people. Human beings are really a special existence that combines insignificance and greatness.
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