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regular person2018-10-25 15:50:28
Physics
regular person, 2018-10-25 15:50:28

Why don't planets fall into the sun?

Tried googling - couldn't find an answer.
Maybe you have come across an article where this is explained in detail.
Or is it just a common unsolved mystery of nature.
All I found is nonsense: that centrifugal force balances gravity. It looks like a stupid quasi-religious and pseudo-scientific dogma. If this were possible, then it would also be possible to make an artificial satellite of the Earth in a permanent orbit. But the satellites fall no matter how you spin them. It is necessary to spend energy to overcome gravity.
The sun attracts the planets with its gravity, just as the planets attract objects in space with their gravity. To maintain artificial earth satellites in a constant orbit, it is necessary to spend the energy of the engines. I fully admit that inside the planet there may be some kind of engine in the form of a rotating core - however, this is not consistent with generally accepted ideas that in nature everything was formed by chance.

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7 answer(s)
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Saboteur, 2018-10-25
@saboteur_kiev

The sun attracts the planets with its gravity, just as the planets attract objects in space with their gravity. To maintain artificial earth satellites in a constant orbit, it is necessary to spend the energy of the engines.

This is because the universe does not work in mathematics, but in physics. Not only does the sun pull on planets, but planets pull on the sun, and planets pull on planets, and asteroids fly around, and unlike the earth, the sun radiates HUGE amounts of energy (read solar wind).
Satellites are very affected by the gravity of the moon, so maintaining an even orbit is problematic.
Some satellites do not fly in pure space, but in the upper atmosphere, where both residual friction and the influence of the earth's magnetic field can be felt. All these and many other factors constantly affect the satellites, as a result, they fall over time, succumbing to the most tangible continuous effect - the gravity of the earth.
Well, who told you that the planets do not fall on the Sun? You just look not at pictures of our system, but try to draw the size of the sun, the size of the earth and other planets on an adequate scale to represent the difference. And then try to draw the scales of the planets and the sun and the distance between them. The process of falling is too long for such a small concept on a cosmic scale as human civilization.
Yes, and the Sun is unstable, even before the Earth falls into the Sun, the Sun will have time to expand, absorb the nearest planets and explode, scattering the rest.

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dollar, 2018-10-25
@dollar

Planets are constantly falling into the sun. But they cannot fall.
Because they do not fly down to the Sun, but fly as if past the Sun. And as soon as the planet lowers its height a little, it turns out that the planet additionally flew sideways and that the Sun is already in the other direction, and the height must be calculated in the other direction. And, unfortunately, the height in the end remains about the same.
Similarly, the Moon and human-launched satellites constantly fall to the Earth, but cannot fall.

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Alexander, 2018-10-25
@NeiroNx

The calculations there are a little more complicated than they study at school. If we take into account that the whole universe is in motion, then in the calculations it is necessary to take into account more than one centrifugal acceleration. On YouTube there is a model of the movement of the solar system in the galaxy, even there it is already difficult to paint all this mathematically - the trajectories of the planets turn out to be spiral, while the sun has a straight line. But the galaxy also moves - so spirals and straight lines are a rough approximation.

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Leonid, 2019-05-16
@caballero

satellites fall because they are slowed down by the remnants of the atmosphere

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Dolosweb, 2020-02-25
@Dolosweb

Because the sun's gravity is negligible, the planets tend to move away from the sun. Even comets with a perpendicular parabolic orbit fall on the sun only at extremely short distances.

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sskopintsev2014, 2020-08-28
@sskopintsev2014

Imagine that we are spinning a weight tied with an elastic band over our heads.
If the weight wants to fly away, then the elastic band will stretch and the tension force will pull it back.
And vice versa.
So gravity attracts the planets: the planet will fly away, and the force of gravity will increase and return it to its place.

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Hhuman, 2021-09-28
@Hhuman

There is an assumption that the satellites are slowed down by the atmosphere. But we should not forget that in the space of the Sol system there are countless meteor dust, which can slow down planets even more than very rarefied gases of the atmosphere. Therefore, this is not the reason. The
satellite needs additional energy so that it does not fall to the ground, or if this energy is too much, the satellite will begin to move away from the planet.
By analogy, the planets also have a constant source of energy that allows them not to fall on the sun for billions of years.
Science just doesn't know anything about it. The cosmos must be arranged much differently than people's ideas about it

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