Why isn t the Earth turned upside down? If the earth doesn t turn anymore

The Earth has evolved over a long period of time to have such a direction of rotation, velocity, and angle of inclination. This can be seen as an evolutionary coincidence, and it is precisely because of this coincidence that orogeny and ocean tides have been created, and the possibility of creating life has been created. Eight of the nine planets in the solar system rotate from west to east, and only Venus rotates in the opposite direction of rotation from other planets, and it is currently believed that the reversal of Venus may be affected by a huge impact, and the same may be the case if the earth is reversed, with a huge impact causing the inner core to invert and counteract the influence of the sun's gravity and the moon on the tides.

Because the current turn of the earth is suitable for human life, if it is really reversed, the climate will change dramatically, and a large number of organisms will become extinct due to environmental changes, which can be simulated by computers.

Nobody has ever said that this turn is positive and that turn is reversed, you can imagine that it is reversed now.

The earth is turned upside down.

The Earth does not revolve around the Sun, but around the center of mass of the system that the Earth and the Sun are composing.

The earth has revolution and rotation, and the earth's motion is the rotation and rotation around the earth under the gravitational force of the cosmic system, so it cannot be reversed.

Because if it's reversed, you're still going to ask.

After learning about geography, you know that the earth is constantly rotating, but it seems that human beings have not been affected in any way, so some people want to ask why the house can keep falling since the earth is moving, let's take a look.

The earth turns, why doesn't the house fall?

The earth rotates and the house does not fall, thanks to the influence of gravity. Gravity was mentioned on the other side of the earth because of gravity, everyone's center of gravity is towards the center of the earth, and although the earth is rotating, the people and houses living on the earth are moving at the same frequency, so everyone can't feel the movement of the earth.

Generally, everyone feels that exercise can only be done with the help of certain references, such as seeing backward trees when running, etc., and seeing the backward scenery outside the window when riding in the car, these are all certain references to compare.

And the rotation of the earth is to rotate with all the things and objects on the earth, including human beings. Therefore, strictly speaking, the matter of human beings and the surrounding objects is relatively unchanged, so everyone cannot perceive the movement of the earth. Moreover, the speed of the earth's rotation is also relatively slow for human beings, and it is not very able to affect human judgment, so it seems that the earth has always been stationary, but in fact this is not the case.

Of course, if the speed is relatively fast, human beings can feel that they are rotating, but the speed of the earth's rotation is very slow, and the angular velocity is relatively small, so human beings can live relatively calmly and cannot feel that the earth is constantly rotating.

What is Earth's gravitational pull.

The earth is a planet with a certain mass, and it will have a certain ability to attract things around it, and it will attract everything towards the center of the earth.

Gravity is very important, and if there was no gravity, humans would be flying everywhere and houses would be drifting around. Of course, if the earth had no gravity, there would be no possibility of life, and human beings would not have had the opportunity to be born here. It is not unreasonable for people to say that the earth is the only home of human beings, and all aspects of the earth are suitable for human life and survival, and if there is no such thing, human beings would not be able to appear, so everyone should protect the earth.

Anyone who has studied physics knows that objects have inertia, and in order to change the way an object moves, it must have enough external energy, so what object has the energy to turn the earth upside down?

Unless there is an alien planet that hits the Earth along the tangent angle of the Earth, and this is destroying the Earth and turning it upside down.

The question is meaningless. The earth is turning, and it is an inertial motion. It's not human that can be changed.

The direction of the Earth's rotation is basically the same as the direction of the revolution, there is a certain eccentricity, Venus is the only planet known to be reversed, so a day on Venus lasts as long as an Earth day, and the Sun rises in the west and sets in the east.

The gravitational pull of the earth causes every object on the earth to be subjected to a gravitational pull towards the center of the earth. You can't experiment with your globe because it doesn't have enough gravity for your ants to walk on it.

Let me tell you this, so that it is easy to understand: take your globe and say that the gravitational pull of the earth is equivalent to putting a big magnet from the center of the globe, and then we will replace it with small iron filings, so that the small iron filings will be subject to the gravitational pull of the magnet in the center of the globe whether they are above or on the left or below the globe, and they will not fall. With that said, you should understand why you didn't fall down, but why didn't you get up and walk upside down?

Let's say: It's still the same as the above example, the center of the ball puts a magnet, and the person is replaced by a small iron man. You put the little iron man on the top of the globe, it's straight, and when you turn it to the bottom you feel it's upside down! But if you think about it from the point of view of the little iron man, the little iron man looks at the land under his corner, it should be the same as the situation above just now, since it is the same, then it does not feel any change or discomfort.

So the gravitational pull of the earth makes us feel the same forever, and all the people who are on the earth are feet under and heads on top.

If you don't understand it, you think the globe is the earth, and the air outside the globe is the universe, put the little iron man on it, and spin it around.

This change in the poles of the Earth's magnetic field also exists in much older ages. From the end of the Precambrian period about 600 million years ago to the Middle Cambrian about 100 million years ago, it was a period dominated by reverse magnetism. From the Middle Cambrian to the Middle Devonian about 100 million years ago, it was a period of predominantly positive magnetism; From the Middle Devonian to the end of the Cretaceous period about 100 million years ago, it was still dominated by positive polarity; From the end of the Cretaceous to the present, the reverse polarity is dominant. If you shorten the history of the earth into a day, you will find that the compass in your hand is spinning like crazy, one moment to guide and the other to point north.

Life on Earth will face a catastrophe. The consequences of the reversal of the Earth's magnetic poles are quite serious and will affect the entire natural world. Experts point out that the greatest disaster is the intense solar radiation.

Usually, these cosmic rays are engulfed by the Earth's magnetic field in space. However, once the Earth's magnetic field disappears during the inversion of the Earth's poles, these solar particle storms will slam the Earth's atmosphere, having a fatal impact on the Earth's climate and the fate of mankind. If this day does come, some low-orbit artificial satellites will also be completely exposed to the blowing of the solar electromagnetic storm and will soon be completely destroyed.

In addition, many organisms that rely on the Earth's magnetic field to navigate, such as swallows, antelopes, whales, pigeons, and magnetotactic bacteria, can be disoriented. Some scientists even suspect that the inversion of the earth's magnetic poles was the cause of the collapse of ancient human civilization.

The earth is spinning, and so are we. But what if the Earth suddenly stops spinning?

At the equator, the Earth's surface, and everywhere on Earth, rotates at 465 meters per second. When approaching the poles, it does not turn as fast as the equator. In San Francisco, the Earth is pushing people east at a speed of 368 meters per second.

When we jump straight into the air, the earth below us doesn't move because we rotate with it. If the Earth suddenly stops turning, everything on Earth will continue to move, flung due east at a speed of more than a thousand miles per hour, and it will be a catastrophic problem. We won't be thrown into space because the escape velocity is 24,800 miles per hour, but our body will instantly turn into an inch caliber bullet.

Actually more like a supersonic tumbleweed.

The astronauts on the ISS may be doing better, but it is unlikely that someone will greet them home on the ground. Winds as fast as they did in the atomic bomb** would pass through the surface and rise into the sky, creating storms of unprecedented scale around the world. The friction of the Earth, which has stopped rotating, and collided with these storms alone is enough to cause a large-scale fire.

When the day is no longer 24 hours but 365 days, the sun seems to freeze in the sky. Without the rotating internal structure, the Earth's protective magnetic field will no longer exist, and we will be exposed to deadly radiation from the Sun. A kilometer-high tsunami would swarm over land, scouring almost all of the land and then migrating to the more gravity-strong poles.

Now the question arises, if the Earth really rotates so fast, why can't we feel it? Why don't we get dizzy? Mainly because the earth is too big, the change in speed is too slow comparatively.

It's not sudden enough to elicit feelings in us. But the change in speed is real.

Because inertia is a property of matter, if there is no force acting on us, we will slowly leave the earth's surface. Luckily, the earth exerts this force on us--- gravity, which can also be said to be the earth giving you weight. At the equator, if the earth doesn't rotate, then there is no need for centripetal force to keep you with the earth, you will be what you are now.

Small changes in the distribution of mass on Earth, such as **, melting ice, man-made dams, and even when you go up or down a stairs, can cause a change in the speed of the Earth's rotation. It's like a figure skater waving their arms away from or close to their body. Now add to this the fact that the tides caused by the Moon hinder the rotation of the Earth, which eventually leads to an erratic rotation speed.

These changes are insignificant, but they add up over time. In 100 million years, a day on Earth will no longer be 24 hours, but 25 hours. This may not sound like much, but in order to do something important, such as delivering accurate GPS information, we need a more accurate timing device.

So, as a solution, scientists will use atomic clocks to record the speed of seconds, and some will measure changes in the speed of the Earth's rotation by looking at distant stars and quasars.

In geography class, we all learned that the actual rotation time of the Earth is 23 hours, 56 minutes and 4 seconds, not exactly 24 hours, which means that each revolution is a few minutes less.

Have you ever thought about the fact that the actual rotation of the earth is 20 hours, starting at 12 noon and coming back with a circle, the sun is still in that position overhead, but from our 24-hour clock, it is 8 o'clock in the morning.

After 2 turns, the sun was still in that position, but our time was 4 o'clock in the morning! The sun is on the head at 4 a.m.?

After turning around again, the sun above me was still in that position, but the time was 0:00 in the morning. Why, then, has the Earth never been reversed between day and night?

The question is not as complicated as it seems, simply put, it is the difference between a sidereal day and a solar day.

1. Sidereal day.

We know that the earth rotates all the time, and the mathematical rule of one rotation is to rotate 360 degrees.

For physical observations, we have to designate a reference frame in the cave, because we use a distant star as a reference frame (the so-called distant star, that is, the star can be considered fixed);

Then relative to a distant star, when the side of the earth that was originally facing the star is facing the star again, we call it a sidereal day, that is, the real rotation period of the earth, which is 23 hours, 56 minutes and 4 seconds.

2. Solar Day.

In 1895, Simon Newcomb, a Canadian-American astronomer from the United States, looked at the sun in the sky and suddenly realized that a separate unit of time should be assigned to the day.

So he kept watch over the sun, and whenever it came to noon, he kept a note of how much time had passed.

A year later, he averaged the time concept called the mean solar second, so that a day was called a mean solar day, which included 86,400 mean solar seconds (24 hours).

This is where the 24-hour calculation comes from, and it is referenced from yesterday noon to today's noon, with the sun overhead.

So the solar day is the movement of the earth relative to the sun. Here we have to take into account one thing, and that is the revolution of the earth.

Although the average distance between the Sun and the Earth is 100 million kilometers, and it only rotates once a year, this does not mean that we can ignore the influence of the Earth's revolution when considering the Earth's rotation.

When the Earth completes a true rotation period, we find that, after considering the effect of revolution, the side that originally began to calculate the rotation period has not yet been facing the Sun again, which means that it will take some time to face the Sun again;

After adding this time, we call it the solar day, that is, 24 hours (strictly speaking, 24 hours refers to the ordinary solar day, and the other is the solar day, but the difference is very small, so I won't say much here).

For us, the sun is the best reference, so our clock also uses 24 hours of time, so every day at 12 o'clock, the sun will still appear overhead.