Why can t the sun eat the earth, and why won t the earth be sucked by the sun?

For anything in the world, force is the cause of changing the state of motion of objects, and the analysis of the sun and the earth There is a gravitational force between them, and the specific expression is f(10,000) = gmm (r*r) g is the gravitational constant, and to study why the sun can't eat the earth, first of all, the force is mutual, this is not like our tug-of-war, which side of the static friction is great, it will pull the other side of the person over, in the universe, there is no friction, so because of the powerful effect, the sun "pulls" the earth and the earth "pulls" The forces of the sun are equal, in a straight line, in opposite directions, so even if they "merge" one day, they will collide at one point on the line of two planets! And what's amazing is that from ancient times to the present, the earth has revolved around the temple in a circular motion, and you know that objects need centripetal force to maintain their circular motion, haha, and that's exactly what happened! The centripetal force required by the earth to rotate the sun is provided by the gravitational pull of the sun between them, and f (ten thousand) = f (direction) is in exactly equilibrium!

And so the earth revolves around the sun for at least 3.9 billion years, unless this equilibrium, which has been maintained for billions of years, is ruthlessly broken by the outside world, and then it is clear that the world will be destroyed hundreds of millions of times worse than in the movie "The End of the World 2012" (the earth melts) Pray that the sun will not go out and the earth will not collide with the sun! I hope that my explanation above has been detailed and clear enough about your problem, and if my explanation can really help your doubts, I will be honored to make progress together.

Yes, it's just a matter of time, because the earth's current mass makes it in a relatively balanced state, with the mining of the earth's materials, a large part of the materials are converted into gas, and the gas will slowly disappear into space, and slowly the earth's mass will be reduced, and the sun's gravitational pull will be greater and greater in another way. In that way, the sun and the earth will get closer and closer.

5 billion years later, the sun's hydrogen fusion turned into helium fusion, and the sun changed from a main-sequence star to a red giant, tens of thousands of times larger than it is now, enough to swallow the earth.

Uh......How could the sun eat the earth? The Sun is the central body of the solar system, and the Earth only revolves around the Sun. So you don't have to think about the fact that the sun will eat the earth.

If you can, you can eat the surface temperature of the sun, 6000 degrees Celsius is enough to melt everything on Earth.

Because it's not delicious, I can't eat it because the sun is too hot.

Hey, the earth is the bone residue that was spit out when it ate something else.

This problem is actually very simple, we don't need to mention the general theory of relativity, we only need basic knowledge of mechanics to explain, for the sake of convenience, we will take the most familiar planet Earth, as an example.

If there is only gravity between the Sun and the Earth, then at such a close distance, the Sun can indeed suck the Earth Bright Locust Sphere through. But the problem is that there is not only gravity between them, but there is also other force, and that is the centrifugal force caused by the movement of the earth.

The Earth is not stationary in space, it is always moving at an average speed of kilometers per second, and the direction of the Earth's movement is always inconsistent with the direction of the Sun, and there will always be an angle between them.

Therefore, we understand that the gravitational force of the sun can be seen as a centripetal force, and the force generated by the movement of the earth can be seen as a centrifugal force. And it is precisely because of the balance of these two forces that the earth will not be sucked by the sun.

We also need to know that the farther away a celestial body is, the less gravitational pull it generates, and the faster an object, the more force it generates. With the above knowledge in hand, let's now take a look at the speed of the planets of the Sun, with the Sun as the center, and they are as follows from near to far.

Mercury: The average velocity is kilometers and seconds.

Venus: The average velocity is kilometers per second.

Earth: The average velocity is kilometers and seconds.

Mars: The average velocity is kilometers per second.

Jupiter: The average velocity is kilometers per second.

Saturn: The average velocity is kilometers and seconds.

Uranus: The average velocity is kilometers and seconds.

Neptune: The average velocity is kilometers and seconds.

Fall into darkness: The sunlight on the earth comes from the sun, and without the sun, the earth will fall into darkness. The Earth is frozen:

Without the sun, the Earth's surface temperature drops rapidly, the waters freeze, and eventually the temperature drops to around minus 200. Leaving the solar system: The sun is a star in the solar system, and if you lose the sun, the gravitational field of the sun disappears, and the stars in the solar system will leave the solar system under the action of inertia.

1. Fall into darkness: The sunlight on the earth comes from the sun, and without the sun, the earth will fall into darkness.

2. The earth is frozen: without the sun, the temperature of the earth's surface drops rapidly, the waters freeze, and the final temperature drops to about minus 200.

3. Leaving the solar system: The sun is a star in the solar system, and if the sun is lost, the gravitational field of the sun will disappear, and the stars in the solar system will leave the solar system under the action of inertia.

The sun, the energy on which all life on our earth depends**, and the energy required for all life activities on the earth comes directly or indirectly from it. If the sun suddenly goes out and disappears, what will happen to our earth, what will happen to us human beings and all living species?

The Sun is essentially a giant plasma fireball, which is the entire solar system.

The most massive celestial body within, from the moment it was born, it became the sole core of the entire solar system. The sun's body is undergoing violent nuclear fusion reactions all the time.

According to calculations, the sun burns millions of tons of mass per second on average, and this burning has been going on for 4.6 billion years.

The mass of the Sun occupies the mass of the entire solar system, which makes it the largest source of gravity in the solar system, so all the celestial bodies in the solar system revolve around it. So what is it like for us on Earth when such a powerful sun suddenly disappears?

We know that the Earth is about 100 million kilometers away from the Sun, which means that it takes about 8 minutes and 20 seconds for the light emitted from the Sun to reach the Earth. If the sun suddenly goes out and disappears, it is in the cone of light.

Outside of us, we don't know or realize it right away, and we don't feel the darkness until about 8 minutes and 20 seconds after the sun disappears.

When the Sun disappears, the gravitational pull that binds the Earth's motion will suddenly disappear, and all the planets will fly out along the tangent of their orbits, and the Earth will fly out along the tangent of its orbit at a speed of nearly 30 kilometers per second. At this time, the entire solar system fell apart.

After the sun disappears, the Earth, which has lost its steady heat**, will slowly begin to cool down. Due to the atmosphere.

The temperature drop will be a slow process, in which a large number of plants and life will slowly become extinct because they cannot adapt to such a huge environmental change.

Due to the advanced nature of technology, the surviving humans will slowly live in the underground world to survive, but the human race will not last long, and will eventually go to extinction. Without sunlight, the Earth's surface will be cooler and colder, eventually reaching minus 100 degrees Celsius.

Eventually, the entire Earth will become a cold frozen planet, wandering in the universe.

So, if the sun suddenly goes out and disappears, the Earth will become a lonely, cold wandering planet in the Milky Way galaxy at a speed of about 30 kilometers per second.

until one day, it crashes into another planet and is completely destroyed or captured by the gravitational pull of another star. No matter what happens to the earth, the human beings on the earth, and even all life, will eventually come to an end and be irretrievable.

According to a study by the University of Warwick in the United Kingdom, it is true that the sun expands and swallows the Earth, but at least for 6 billion years, the sun's life will not come to an end.

That is to say, the life span of the sun is at least 6 billion years, and the sun is a yellow dwarf (spectrum G2V), and the life span of the yellow dwarf is about 10 billion years, so the life of the sun is still about 4 billion years at most, which is the life of the sun.

As long as the sun exists and the earth is not swallowed, then the earth's civilization will continue to continue, spanning at least 6 billion years, which is a fact that can be explained by science.

A 2008 study showed that when the Sun enters its red giant phase, its radius will become extremely large, reaching almost 100 million kilometers in its outermost layer, engulfing Mercury, Venus, and Earth. It takes about 5 million years for the Sun to complete its transformation into a red giant, which is almost instantaneous compared to the lifetime of a star.

In addition, the luminosity of the sun has been increasing at a rate of about 10% per billion years. As a result, the extent of the so-called "habitable zone" around the Sun will gradually change. The so-called habitable zone refers to the area where the distance around the star is moderate, so its surface temperature is relatively moderate, allowing water to exist on the surface of the planet in liquid form, and the current habitable zone range of the solar system is roughly between the distance from the sun in astronomical units (au).

As the luminosity of the sun rises, this area will gradually move outward. When the Sun eventually became a red giant, Mars was already in the habitable zone long before that. At the same time, the Earth will be so close to the Sun that it will dry up under the increasing heat of the sun, the oceans will evaporate, and the water molecules will be broken down into oxygen and hydrogen by ultraviolet rays and escape into space.