What is the largest planet in the world?

What is the largest planet in the world?

Many people think that the sun is the largest star, but the sun belongs to the same kind of medium size in the star family. In fact, many celestial bodies are bigger than the sun. Such as superstar, Supergiant star and so on. At present, the largest known planet is a super red giant in Cepheus, named Cepheus VV A, which is millions of times larger than the sun!

brief introduction

Like other stars, during the main sequence, hydrogen will combine into helium, but the life span of stars is shorter. The core of a star whose mass is 0/5 times that of the sun/kloc-will use up all its hydrogen in ten million years. Because of its huge mass, the temperature and density of its core are high enough to combine helium into carbon and form a hydrogen combustion shell. The helium nucleus burns stably because the gravity of the star is large enough to control it. Because heat is generated by the core, the outside of the star will expand more than the red giant, forming a super red giant. Due to the high temperature generated by the core, the outer shell of the star will expand bigger than the red giant and become a super red giant. A massive star, after the hydrogen fuel is exhausted, can not only synthesize helium into oxygen, but also convert core oxygen into carbon, and its core temperature is even high enough to synthesize carbon into heavier elements such as silicon until iron is synthesized.

When iron is synthesized, stars cannot synthesize iron into heavier elements to generate energy, because this process in turn requires energy. Because there is no energy, the core will collapse due to gravity and the density will be higher and higher. Protons and electrons in the core will combine into neutrons under great pressure, resulting in neutron degenerate pressure to offset the further contraction of the core and form a very hard core.

When it is in the super red giant stage, its core will eventually collapse and heat up, thus triggering a new round of nuclear fusion and a series of nuclear reactions in which lighter elements are fused into heavier elements. Internal nuclear combustion will be carried out one by one in the following order:

About 2? 108K, helium melts into carbon.

Around 109K, carbon is ignited, and through a series of nuclear reactions, O 16, Ne20, Na23, Mg24, Si28 and other elements are generated. After the oxygen nuclear reaction is closed, silicon and magnesium burn successively until a large number of elements such as iron and nickel are produced in the central area.

The star with the largest mass can generally complete the above whole process. Generally speaking, the level of nuclear fusion of a star mainly depends on its mass.

Super Red Giant Star (RSG)

Dying massive stars are very cold and hundreds to thousands of times the diameter of the sun.

It is the first level of York spectral classification (photometric classification) of stellar spectral classification, and it is one of the Supergiant star. Although their mass is not the largest, they are the largest stars in the universe.

After the hydrogen in the central region of the star is exhausted to form a nuclear sphere composed of helium, the thermonuclear reaction of hydrogen fusion cannot continue in the central region. At this time, the gravity pressure is not balanced by the radiation pressure, and the central region of the star will be compressed and the temperature will rise sharply. After the temperature of the central helium core ball rises, the layer of hydrogen-helium mixed gas near it is heated to the temperature of hydrogen fusion, and the thermonuclear reaction begins again. As a result, the helium sphere gradually enlarged, and the hydrogen combustion layer also expanded outward, so that the outer layer of the star was heated and expanded and turned into a red giant or a red Supergiant star. During the metamorphosis period, the hydrogen combustion layer may generate more energy than that during the main sequence star period, but the surface temperature of the star will not increase but will decrease.

Internal structure The elements in nature are not only hydrogen, helium, carbon and oxygen, but also some in living things, wood, soil and rocks.

There are more than 20 protons and neutrons in the nuclei of silicon, magnesium, sulfur, phosphorus, iron and other heavy atoms. if

These elements cannot be made in the sun and most stars.

The largest planet in the solar system.

Jupiter is the largest of the nine planets in the solar system. If arranged from small to large, it is: Mercury (diameter 4878km), Mars (diameter 6794km), Venus (diameter 12,104km), Earth (diameter12,756km) and Neptune (diameter 49528km). So Jupiter is the largest planet in the solar system, and its mass is 2.5 times that of the other seven planets combined.

The largest planet in the world

Outside the solar system, the largest planet in the known universe has been discovered. It is a planet mainly composed of hydrogen, and its volume is 20 times that of the earth. It is estimated that the temperature above it is as high as 1260 degrees Celsius, which is not suitable for any living thing. Scientists name this planet? TrES four? Its diameter is 1.4 times larger than Jupiter, the largest planet in the solar system. Scientists found it in the constellation Ursa, orbiting a star 1400 light years away. Scientists have also discovered another smaller planet called? TrES three? . This important discovery was made by a group of scientists in Lowell Laboratory, USA. Researcher Manduchev personally wrote an article and published the news in Astrophysics Newsletter Quarterly. Lowell Laboratories cooperated with California Institute of Technology to observe this giant planet with an astronomical telescope on the Canary Islands in Spain. The giant planet was first detected last spring. This discovery was later confirmed by Harvard University and Hawaii W.M. Keck Laboratory. Bos, an expert at the Carnegie Institution in Washington, said? This new discovery tells us that nature is full of mystery and often surprises us. There are many possibilities beyond our imagination in the universe. ? Except? TrES three? And then what? TrES four? In addition, scientists are still observing another planet in the same cluster, but they are not sure what nature that planet belongs to for the time being. Lowell Laboratory enjoys a high status in the field of astronomy in the United States and even in the world. Pluto was discovered in the laboratory by a 24-year-old researcher in 1930, and later became the ninth largest planet in the solar system. But last year, Pluto was abolished as a planet and was reduced to a dwarf planet.