Why doesn t the Earth fall in the universe

Tao Zile: When you said that it fell, it was under the action of gravity that the object was approaching the center of the earth. In the universe, if the earth is to fall, it must also be achieved by the action of a certain force. In the current universe, the earth is roughly in a state of equilibrium under the action of two major external forces (the gravitational pull of the sun and the moon).

First of all, the Earth and the Moon attract each other, forming the Earth-Moon system, and the Moon moves around the Earth as if you were going around in circles in the air with a stone tied to a rope. The whole of the earth and the moon moves in a nearly circular circle around the sun under the gravitational pull of the sun. And the other celestial bodies in the universe have very little force on the earth, so you can ignore it.

Deng Chunbo of Linchuan No. 1 Middle School.

You objectively believe that the universe is divided into up and down, but in fact, up and down, only with comparison and reference, there is up and down, and the result is different if the reference object is different.

You think that there is nothing around the earth that you know, that it is empty all around, and then why it is there and not there, the reason is very simple, because the mass of the earth is small, the mass of the sun is large, and the sun attracts the earth to follow its orbit all the time in the four circles of the sun, just like the moon revolves the earth.

The universe, you think that the universe is very vast, very big, but you want to know whether it has a margin, in fact, according to people's current understanding, you can say that it is infinite, because there are theoretical inferences that the universe has been in the expansion stage now, but from a dialectical point of view, any matter and any range, people can think that it has a boundary, just like people can't tolerate 1+n years later, just say that it is forever.

It is recommended that the landlord figure out ** first"down", and then consider where the earth is going"drop".

Weightlessness and running are two separate issues. Please clarify the concept before asking questions.

The landlord has not studied physics, and the appraisal is complete.

If she drops.

Drop ???

Because she doesn't know where to go.

That's why it doesn't fall off.

I can't help you with this question now, because just as we now look at the ancients' "heaven and earth" as so naïve, future generations may think that our current understanding of the universe is also so naïve!

The landlord is so cute - like when I was a kid, I also asked the question of why the earth doesn't fall ......But this one ......Khan ......Tell us the direction of the universe first!

This question can be understood as whether the Earth will collide with other planets.

Generally speaking, the larger celestial bodies in the universe have their fixed orbits, and the nine planets in the solar system keep a certain distance from each other from the inside out, and their orbits do not intersect, so that they will not collide, so the earth will not fall to any other planet in the universe.

The universe is boundless, it is infinite, and all celestial bodies basically orbit around their own center of motion without departing from this center, so their movement is regular, so they will not run around.

These are based on gravitation, and the motion of the universe is basically orderly.

Maybe the earth is going down or running around.

But we don't know. Because other objects in space are also running down or running around, but we can only use the objects around us as references, so even if the earth is running around, we have no way of knowing, because the only perceptible eternal fortune we can perceive is the movement of the earth relative to other planets (or other objects).

There's nothing down there that draws him in!

Hehe. It is advisable to take a look at Newton's book.

There's gravity.

There's gravity.

Haven't you learned the Three Laws? 》

The earth has a soul! It wants to protect the creatures that live within!

There is buoyancy, or the earth is falling, but it is not falling to the end.

Dropped? Where to drop? In the universe ** is the next?

You're stupid, where are you going to fall?

The earth is a round sphere, and people and houses stand on the surface of the earth, with the soles of their feet facing the center of the sphere. What we usually call falling is when people or things move towards the center of the ball under the gravitational pull of the earth.

The earth itself exists in cosmic space and is mainly affected by the gravitational pull of the sun, and if you must say "down", it should be in the direction of the sun. The Earth does not "fall to the Sun" because the Earth is moving in a circle around the Sun at a certain speed. The circular motion itself makes the earth fly far away relative to the sun, but the gravitational pull of the sun causes it to fly towards the sun, and the two forces are balanced, maintaining the earth moving in a uniform circular motion around the sun, similar to the artificial earth satellite will not fall to the earth.

The earth in the universe attaches importance to having hanging? Why didn't it go down, or did we not find it? If the earth does not fall because of the gravitational pull of the sun, then who is attracting the sun?

If you want to fall off, you have to think that it will fall to the ** to go to the jacket.

Everything is attractive.

The direction of movement was maintained.

It's like if you tie a stone with a rope and spin it, the rope gives the stone a centripetal force, so the stone will keep rotating around the center, and the gravitational force between the earth and the sun is greater, so the earth revolves around the sun, and it won't "fall" down.

The universe is expanding, and it's a matter of relativity, and we need referencing.

What does it mean to fall? Perhaps the Earth and its very large galaxies are declining. Just keep the constant velocity between them. Movement and stillness are relative. There must be references.

First of all, you have some problems with this question. There is no difference between the earth and the earth. If one day a super-attractive object approaches the Earth [such as a black hole], it may pull the Earth away.

There is a vacuum in the universe, how can it fall without gravity, and the earth just revolves around the star Sun.

The greater the mass of an object, the greater the attraction to other things.

The mass of the Sun is 330,000 times that of the Earth, so it has a very strong gravitational pull on the Earth, so that the Earth cannot detach itself from its orbit. In this way, the earth will not fall.

What you mean is not clear.

When you say fall, you say.

Where to fall.

So netizens can't help you.

Because the earth can't fall down when it hangs in the sky, the sun is big and the earth is small, the earth runs around the sun, and the earth has a big moon and a small moon that runs around the earth.

Because the gravitational force of the universe is very small, and the earth is also affected by the gravitational pull of the sun.

The universe is void, there is no up and down, left and right, so there is no point in going up and down. Gravitational force is direction.

It's a kind of reasoning science around the Earth that the Earth won't fall.