The spaceship was rapidly heading towards Jupiter, and Hua Feng and the others had a feeling that they had not left the earth...... This is because cultivation and study have been continuing......

Comets belong to small bodies in the solar system, usually only a few kilometers in diameter, and are mainly composed of volatile ice. Their orbits have a high eccentricity, with perihelion generally on the inner side of the inner planet's orbit and aphelion outside Pluto. When a comet enters the inner solar system, its proximity to the Sun causes the material on its icy surface to sublimate and ionize, producing coma and dragging a comet tail made up of gas and dust particles that can be seen by the naked eye.

Short-period comets are comets with orbital periods shorter than 200 years, and long-period comets can have orbital periods of thousands of years. Short-period comets, such as Halley's Comet, are thought to have originated from the Kuiper Belt, while long-period comets, such as Comet Haile Popper, are thought to have originated in the Oort Cloud. There are many groups of comets, such as the Cruz comet, that may have originated from a collapsing parent body. Some comets have hyperbolic orbits that may come from outside the solar system, but it is difficult to accurately measure these orbits. Comets whose volatile substances are dispersed by the Sun's heat are often classified as asteroids.

Centaur herds are scattered in a range of 9 to 30 astronomical units, that is, orbiting between Jupiter and Neptune, similar to comets dominated by ice. The largest known object in the centaur herd is 10,199 Cha

iklo, with a diameter of 200 to 250 km. The first to be spotted was 2060 Chi

o

, because it produces comets-like coma when approaching the Sun, and is classified as a comet. Some astronomers classify the Centaurs as discrete objects within the Kuiper Belt, and instead see them as a continuation of the outer discrete disks.

The region outside Neptune, often referred to as the Outer Solar System or the Outer Neptune Region, is still a vast unexplored space. This region appears to be a world of small bodies in the solar system (the largest is less than one-fifth the diameter of the Earth and much less massive than the Moon) and is composed mainly of rock and ice.

The Kuiper Belt, in its original form, was thought to be a ring of debris and debris similar in size to asteroids, but mostly made up of ice, spreading between 30 and 500 AU from the Sun. This region is thought to be the source of short-period comets such as Halley's Comet. It is mainly made up of small bodies in the solar system, but many of the largest objects in the Kuiper Belt, such as Tronis, Varana, 2003 EL61, 2005 FY9, and Erkus, may be classified as dwarf planets. It is estimated that there are more than 100,000 objects in diameter greater than 50 kilometers in the Kuiper Belt, but the total mass may be only one-tenth or even one-hundredth of the mass of the Earth. Many Kuiper Belt objects have more than two moons, and most of their orbits are not in the ecliptic plane.

The Kuiper Belt can be roughly divided into two parts, the resonance zone is composed of celestial objects that have a resonance relationship with Neptune's orbit (when Neptune orbits the Sun three times, it orbits the Sun twice, or Neptune orbits twice), and Neptune itself is a member of the Resonance Belt. The traditional members are objects that do not resonate with Neptune and are scattered in the range of 39.4 to 47.7 AU. Traditional Kuiper Belt objects are classified as QB1-like objects after 1992 QB1, one of the first three objects to be discovered.

Pluto (♇ ibid., this is one of them) and Charon

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It is uncertain whether Charon should be classified as a moon or a dwarf planet as it is currently considered, because the center of mass of Pluto and Charon orbiting each other is not below the surface of either one, forming the Pluto-Charon binary system. The other two very small satellites, Nix and Hyd

a), orbiting Pluto and Charon.

Pluto is in the resonance zone and has a 3:2 resonance with Neptune (when Pluto makes two revolutions around the Sun, Neptune makes three revolutions). Objects in the Kuiper Belt with such orbits are collectively referred to as Pluto-like objects.

The discrete disk overlaps the Kuiper belt but extends outward into space. The objects in the discrete disk are supposed to have been thrown from the Kuiper Belt into erratic orbits due to gravitational perturbations caused by Neptune's outward migration in the early stages of the formation of the solar system. Most ecliptic discrete objects have perihelion in the Kuiper Belt, but aphelion can be as far away as 150 AU, and the orbits are tilted to the ecliptic plane at a large angle, even perpendicular to the ecliptic plane. Some astronomers believe that the ecliptic discrete objects should be another part of the Kuiper Belt and should be called "Kuiper Belt Discrete Objects".

Eris (136199 E

IS) (mean distance 68 AU), also known as Zena, is the largest known ecliptic discrete object. The dwarf planet is located 14 billion kilometers from the Sun, in addition, it has a moon. This sparked a planetary debate, with some claiming to be the tenth largest planet in the solar system at the time of discovery, but then Pluto was defeated as a dwarf planet, and after a heated debate, astronomers voted to reduce the number of planets in the solar system to eight and classify Pluto as a "dwarf planet", a category that also includes Eris and the asteroid Ceres.

Scientists from the California Institute of Technology in the United States discovered the planet at the edge of the solar system in 2003, numbered 2003UB313, tentatively named Xena, until July 29, 2005, when the discovery was announced to the outside world. It is reported that astronomers from various countries denied that it was a large planet at the General Assembly of the International Astronomical Union on August 24, 2006.

According to reports, Xena's radius is about 1,490 miles, which is 77 miles larger than the dwarf planet Pluto at the edge of the solar system. Xena is 9 billion miles from the Sun, which is about three times the distance between Pluto and the Sun, or about 97.6 AU, and one AU is the distance between the Sun and the Earth. It would take 560 years for Xena to circumnavigate the sun.

The star is round in shape and is likely to be twice the size of Pluto. He estimated that the newly discovered star was estimated to be 2,100 miles in diameter, 1.5 times the diameter of Pluto.

The star is at an angle of 45 degrees to the main plane of the solar system, where most of the other planets orbit. That's why it has never been found, Brown said.

On January 20, 2016, American scientists announced the discovery of an unknown giant planet nicknamed "Planet 9" on the Sun. Astronomical Journal researcher Batikin (Ko

sta

ti

Batygi

) and Brown (Mike B

ow

They discovered the planet through mathematical models and computer simulations, although not directly observed. The star is about 10 times more massive than Earth, orbits an average 20 times farther from the Sun than Neptune, and it takes 10,000 to 20,000 years for the new planet to orbit the Sun. The planet, which is about 5,000 times more massive than Pluto, is considered by scientists to be a gaseous planet, similar to Uranus and Neptune, and will be the true ninth largest planet.

There is no well-defined boundary for where the solar system ends and where the interstellar medium begins, as this is determined by both the solar wind and the gravitational pull of the sun. The distance that solar wind can affect the interstellar medium is about four times the distance of Pluto, but the Sun's Loch sphere, which is within the reach of the Sun's gravity, should be more than a thousand times that distance.

The heliosphere can be divided into two regions, and the maximum distance traveled by the solar wind is about 95 AU, which is three times the orbit of Pluto. This is the edge of the terminal seismic wave, where the solar wind and the interstellar medium collide and impulse. Here, the solar wind slows down, condenses, and becomes more chaotic, forming a huge ovoid structure, the so-called heliosheath, which looks and behaves like a comet's tail, which continues outward for about 40 AU in the direction of the sidereal wind, but extends several times this distance at the tail end in the opposite direction. The outer edge of the heliosphere is the heliopause, where the solar wind finally terminates, and beyond is interstellar space.

The shape and form of the outer rim of the heliosphere are likely to be influenced by the hydrodynamics of the interaction with interstellar matter, as well as by the Sun's magnetic field, which is dominant at the southern end; Beyond the heliopause, at about 230 AU, there is a bow shock wave, which is generated when the Sun travels through the Milky Way.

No spacecraft has yet flown beyond the heliopause, so the environmental conditions in interstellar space are not yet known. Little is known about how the heliosphere protects the solar system from cosmic rays. For this reason, the task of being able to fly over the heliosphere has already been proposed.

The Oort cloud is a hypothetical spherical cloud surrounding the solar system, covered with inactive comets, about 50,000 to 100,000 astronomical units from the Sun, which is about one light-year, i.e., the Sun and Proxima Centauri (P

oxima) distance of a quarter.

The theoretical Oort cloud, with its trillions of icy objects and massive mass, surrounds the solar system at a distance of about 5,000 AU and up to 10,000 AU, and is considered the source of long-period comets. They are thought to be comets that were thrown there from the inner solar system by the gravitational pull of the outer planets. Oort Cloud (Oo

tCloud) objects move very slowly and can be affected by unusual situations, such as collisions, gravitational effects of celestial bodies, or galactic tides.

Sed

a) It is a huge, reddish Pluto-like object with a perihelion of 76 AU and an aphelion of 928 AU, and it takes 12050 years to complete a huge, highly elliptical orbit. Michael Brown discovered this object in 2003 because its perihelion was too far away to be affected by Neptune's migration, so it was not considered a member of the discrete disk or Kuiper belt. He and other astronomers believe that it belongs to a new group, along with perihelion at 45 AU, aphelion at 415 AU, 2000 CR105 with an orbital period of 3420, and perihelion at 21 AU, aphelion at 1000 AU, and (87269) 2000 OO67 with an orbital period of 12705. Brown named this group the "Neolt cloud", and although it is still relatively close from the Sun, it may have formed through a similar process. Sedna's shape has been confirmed, very much like a dwarf planet.

There are still many unknowns about our solar system. Taking into account nearby stars, it is estimated that the Sun's gravitational pull can control a range of 2 light-years (125,000 AU). The extent to which the Oort cloud extends outward is probably not more than 50,000 AU. Despite the discovery of Sedna, which is between the Kuiper Belt and the Oort Cloud, there are still tens of thousands of AU radii that have not been explored. The region between Mercury and the Sun is also being studied ongoing. It may still be found in unknown regions of the solar system. At the moment, the Earth's position is still third, and it is a wonderful position.

There are five dwarf planets confirmed: Ceres (Ce

es), Pluto, Eros

is), Makemake, Haumea.

The Solar System is located in a galaxy known as the Milky Way (a barred spiral galaxy with a diameter of 100,000 light-years and more than 200 billion stars, not a spiral galaxy).

Our Sun sits on one of the spiral arms on the outer periphery of the Milky Way, called the Orion Arm or Local Arm. The Sun is 25,000 to 28,000 light-years away from the galactic center and travels at a speed of about 220 km/s in the Milky Way, so it takes 225 million to 250 million years to orbit the Milky Way, and this revolution is called the galactic year.