A comet will fly next to the Earth, what do you think might happen?

The Earth's current rotation speed is in a steady state, and of course there are small fluctuations, but they are so small that they can almost be ignored. The earth's mass, shape, position of the center of gravity, and revolution speed directly determine the rotation speed, and other external factors will interfere very little. It should also be emphasized that the movement of galaxies and celestial bodies in the universe is a kind of flinching motion.

That is, the silver nucleus rotates the Milky Way, the sun rotates the solar system, the earth rotates the earth-moon system, the large and small galaxies and celestial bodies in the universe are interlocked, this kind of rotation is universal in the universe, the rotation of the earth is essentially a kind of rotation, and so on, the rotation speed of the Milky Way determines the rotation speed of the earth, that is, the rotation speed of the sun directly determines the rotation speed of the earth.

These things have no point in arguing at all, they are all hypothetical things, and there are many factors to consider, so there will be many possibilities, it is possible to crash off track, it is possible to break it, it is possible to die together, it is also possible to pass through the heart, the earth through the comet or the comet through the earth is not just the size of the volume. ‍‍

The largest comet impact event in the history of the earth is equivalent to a flying grasshopper hitting an elephant, the speed of the elephant will not change, and the impact of passing comets on the earth is even smaller, which is completely negligible. ‍‍

When a comet with a relatively large mass flies near the earth, of course, the comet and the earth will have a larger gravitational force, but the direction of this gravitational force is past the center of mass of the earth, so there will be no moment on the earth, that is, when m(f)=0, the angular acceleration of the earth is equal to zero. ‍‍

I think that if a comet flies next to the Earth, then the Earth's magnetic field will definitely be disturbed, and the signal used by our mobile phones, as well as the signals of other communication devices, will definitely be greatly affected.

If the comet flies over the equatorial plane of the Earth, it can affect the rotation of the Earth, first accelerating and then decelerating, and eventually the two can cancel each other out without affecting the rotation period of the Earth. ‍‍

I was just watching a movie, and the night the comet came, it was so big that it was not called a comet, and the earth could be thrown out. ‍‍

For example, if a ping-pong ball flies next to a watermelon, will it have an effect on the watermelon? ‍‍

I think there are probably a lot of meteors in the sky in a short period of time.

Your name, have you seen it? That's probably it, well, it can't be wrong. Hee-hee.

Comets' orbits are unstable and are affected by the gravitational pull of the Sun, planets, and other earthy objects, so their orbits are very complex and difficult. Some comets pass by the Earth once in a few decades, either because their orbit is close to that of the Earth, or their orbit is a very large elliptical that takes a long time to orbit the Sun.

On the other hand, some comets may just flash by because their orbits are angular to the Earth's and the Earth's are very large, or their orbits are very small, so they just rush past the Earth.

In addition, the visibility and duration of comets also depend on their size, brightness, and distance. Some comets can be very large, so they can be seen on the Earth's bucket for a longer period of time. Other comets may be so small that they can only be observed by professional astronomers, or in some cases, they will be too far away to be seen on Earth.

Because comets generally revolve around the Sun in a flat orbit with a very high eccentricity.

If the eccentricity of its orbit is less than 1, then it is an ellipse, and these comets circle the sun at certain intervals, so basically every other comet return year, the comet's perigee can be seen as long as it passes through the Earth's orbit.

Some comets orbit with an eccentricity equal to 1, and these comets have hyperbolic or parabolic orbits, and these comets come close to the Sun only once in their lifetime (they are often observed in the Kuiper Belt or even the Oort Cloud, which falls into the inner circle of the solar system due to unknown gravitational perturbations). ）

Of course, even if the manuscript is an elliptical simple orbit with an eccentricity of less than 1, there are some eccentricities that are not close to 1 at all, and these comets tend to have periods of thousands of years (the longest comet was discovered in 2013, and his cycle is as high as 51 million years) They are fleeting passers-by in the lifetime of humans.

Halley comet Halley'The first famous great comet that was predicted to reappear and confirmed. When it appeared in 1682, the English astronomer Halley noticed that its orbit was similar to that of the comets that appeared in 1607 and 1531, thought it to be three occurrences of the same comet, and predicted that it would reappear in 1758 at the limb fluid base or in early 1759. Although Halley died in 1742 and did not see it reappear, it did return in 1759, an astonishing achievement in the history of astronomy.

Hence the name Halley's Comet. Its orbital period is 76 years, its perihelion is 88 million kilometers (astronomical units), its aphelion is 5.3 billion kilometers (astronomical units), and its orbital eccentricity is recorded in Chinese history books in detail. On the early recording time, "Spring and Autumn" is the first to be recommended

Spring and Autumn said: In the fourteenth year of Lu Wengong (613 B.C.), "In the autumn and July, there were stars entering the Beidou. "This is the world's first definitive record of Halley's Comet.

On the early content of the record, the Western Han Dynasty's "Huainanzi" is the first to be recommended"Huainanzi Military Training" said: "King Wu fell, the east and greeted the year, to the water and water, to the head and fall, the comet came out, and the Yin people were given their handles."

According to Chinese astronomer Zhang Yuzhe, this is a record of the return of Halley's Comet in 1057 BC. Since 240 B.C., every time Halley's Comet appears, China has recorded it, and the number of burials and the number of records are not found in other countries. Halley's Comet is estimated to have a raw mass of less than 10 trillion tons.

If the average density of the comet nucleus is 1 gram per cubic centimeter, the radius of the comet nucleus should be less than 15 km. It is estimated that it loses about 2 billion tons of mass per revolution, which is only a small fraction of its total mass, so it will be around for a long time.

How did comets survive when they approached the Sun and their mass had been wiped out?

They are not extinguished. Comets orbiting the inner solar system are short-lived, on average, they do not live more than tens of thousands of years. The reason why we can still see comets during the life stages of this solar system is that occasionally new comets fall into the inner solar system from the Oort cloud.

The Oort cloud is a spherical cloud-like structure made up of comets that is about 50,000 times farther from the Sun than the Earth from the Sun (about 2,000 AU from Pluto, the average distance from the Earth to the Sun).

Visit comets in the inner solar system, usually 2 to 10 kilometers (about 1 to 6 miles) in diameter. Comets are mostly made of ice. As the comet gets closer to the Sun, a portion of the comet's surface is heated and melted by the Sun and evaporated.

The surface of a comet is porous, but sunlight does not completely penetrate the comet to heat its interior.

Unlike Earth, comets have strange (elongated, non-circular) orbits. Perihelion is the closest point to the Sun in the orbit of a planet (or comet). As a basic rule, a comet with perihelion in astronomical units will evaporate its surface nearly a meter deep every time it passes perihelion.

Comets within perihelion are evaporated several meters deep each time. As a result, a typical comet can orbit the Sun about a thousand times, while larger comets usually live longer.

New research by Christian Estrup, an astronomer at Leiden University in the Netherlands, has found that all comets in the solar system could have come from the same place.

The report was published in the journal Astronomy and Astrophysics.

Comets orbit our solar system and are usually made up of ice, dust, and small rock particles. Its core can reach tens of kilometers. Eststrup said

Comets are everywhere and sometimes orbit around the sun. Comets have hit Earth in the past. We know what comets are made of and what molecules are present in them.

They vary in composition but are often considered a type of ice hockey. What would I find if I applied an existing chemical model to a comet? “

With the assistance of the astronomical research team at Leiden University, Estrup applied a chemical model to fourteen comets of the solar system species and was surprised to find that they all had the same origin.

And this origin is located somewhere near the Sun when it was young, when it was still surrounded by protoplanetary disks and our planets were still forming. The model shows that the region around the Sun, where the temperature varies from 21 to 28 Kelvin, is about minus 250 degrees Celsius, which is very cold, and all the molecules we know are ice.

"From our model, we know that there were some reactions during the comet glacial period, albeit very slowly, in the range of 100,000 to 1 million years, but this could explain why there are different comets with different compositions," Eststrup said. ”

If comets come from the same place, how do they end up in different locations and orbits in our solar system? "Although we now think they formed in similar positions around the young Sun, some of these comets may have been disturbed in their orbits, such as Jupiter," Eststrup said.

As a scientist, Eststrup said that the number of samples for comets is relatively small, saying: "There are only fourteen comets, and the samples are very small. That's why I'm looking for more comet data to further test our hypotheses with our model. ”

Eststrup also hopes that astronomers who study the solar system and its evolutionary origins can use his results. "Our research shows that comets formed early in the formation of the Sun, so this new information may give them new insights," he said. ”

Comets are closely associated with the beginning of life on Earth. "We still don't know how life on Earth began," Eststrup concluded.

But the chemical reactions of comets can lead to the creation of organic molecules, including some of the building blocks of life. If the right comet hits the right planet and has the right environment, life may start to grow, so understanding the birth of a comet may help us understand the birth of life on Earth. ”

Comets are supposed to be celestial bodies in the universe, but they don't happen every day, they have periodicity. Under the perturbation of the planets, all periodic comets become non-periodic comets, and some non-periodic comets can also become periodic comets.

Comets are celestial bodies that roam the universe. They are not celestial objects that we see very often. There are two types of comets:

Periodic comets and non-periodic comets. Comets of different periods have different cycles, some return every few years, some every few decades, and some every hundred or even thousands of years. Other aperiodic comets never return.

Most of the orbits of periodic comets are elliptical and parabolic. However, the trajectory of a non-periodic comet is an open hyperbola, caused by the gravitational pull between the celestial bodies.

The first is that comets form at the same rate as they disappear. The other is that there are countless comets in the universe, so they haven't disappeared after 4.6 billion years. However, the first is unlikely, as astronomers have not found any evidence that the comet is still forming.

These comets revolve around the Sun at a particularly slow and constant rate for millions of years. However, in some cases, the comets' movements can be altered by collisions with each other or by the attraction of other stars. In some cases, it revs faster.

At this point, the radius of the orbit will inevitably increase, and eventually it will be separated from the solar system forever. Conversely, the rotation may slow down, and the comet will move closer to the center of the solar system. In this case, the comet will appear on Earth in a particularly bright image, and from then on, it will move along a new orbit (unless this orbit changes again due to collisions between stars), which will eventually disappear.

Comets are a wandering object in the universe, and it is not a celestial object that we often see. There are two types of comets: periodic comets and non-periodic comets, with periods of different periods having irregular periods, and some returning once every few years.

The vast majority of comets come from the Oort cloud, which is considered the outermost boundary of the solar system. The Oort cloud is a spherical "cloud" two light-years in diameter that envelops the solar system and revolves around the galactic center with it. "Clouds" is just a description, but the matter here is very thin, with only a few dust and a sporadic core of comets.

In the future, the "Voyager" will not hit anything when it passes through.