Too high temperature should fall apart?
The stars in the universe are the objects that emit light and heat. Their surface temperature is very high. For example, the surface temperature of our sun reaches 5600 degrees Celsius, so it can radiate a lot of heat and light to the outside, and some surface temperatures of some stars even It can reach hundreds of thousands of degrees Celsius. The luminosity of such stars is very high, but some small-mass stars have a surface temperature of only 2,000 degrees Celsius. For example, many red dwarfs have temperatures between 2000 and 3800 °C.
Planets are celestial bodies that do not emit light or heat, so the surface temperatures of most stars are very low. But if the planet is closer to the star, then it will be affected by energy radiation such as the main star illumination, resulting in a high surface temperature.
For example, in our solar system, Mercury, the temperature of the area directly exposed to the sun can be as high as 430 degrees Celsius; and some planets in the universe are closer to the main star, the surface temperature is above 1000 degrees Celsius, if it is a rocky planet, then its surface will It is sun-dried into lava.
There are also many hot Jupiters in the universe. They are massive planets that are very close to the main star. The energy of the main star is very strong, so the temperature of the atmosphere is very high, and some even reach thousands of degrees Celsius. Such massive planets usually There are magnetic fields. Because they are closer to the main star, the received stellar winds are stronger. Therefore, in their polar regions, there will be a strong aurora phenomenon, and the brightness is thousands of times the brightness of the aurora on the earth.
The planet with the hottest surface temperature in the universe is known as KELT-9b, a planet in the Cygnus. It is 650 light-years from Earth. It is observed that the surface temperature of this planet is as high as 4327 °C, and most of the universe The surface temperature of a red dwarf usually does not exceed 3000 degrees Celsius, so it can be said that the temperature of this planet is higher than most stellar temperatures.
The surface temperature of the planet is high. A prerequisite is that the surface temperature of the main star is high. The main star of this planet is 3.5 times the volume of the sun, the temperature is as high as 9897 ° C, and the KELT-9b is very close to its main star. The revolution period is only 1.5 days, which means that it is only one and a half days in the year above. It is the massive thermal radiation of the main star that causes the temperature of this planet to be very high.
The KELT-9b is a hot Jupiter. Like Jupiter, it is a gaseous giant planet. It is three times larger than Jupiter, but its density is only half that of Jupiter. It is considered to have a spectacular aurora. Because the surface temperature is too high, it also emits light when it revolves. It can be called a planet that emits light. And it has a comet-like tail that stretches more than half a circle in orbit, which also reflects its main star, the evaporation of huge heat radiation.
The internal temperature of the planet is more difficult to measure. It is usually the planet with higher mass. The higher the internal temperature, the higher the internal temperature of Jupiter in our solar system, about 30,000 degrees Celsius, but some of the mass in the universe is more than 10 times that of Jupiter. There are no planets with nucleus fusion inside. During the period of formation, the internal temperature can reach as high as one or two million degrees Celsius, but it cannot reach the degree of nucleus fusion, because once it is ignited, the star cannot be called a planet. Instead, it should be called a brown dwarf, and once the nucleus fusion is ignited, the internal and surface temperatures of the star will rise sharply.