It is generally believed that the sun is the hottest star. In fact, the temperature of the core is higher than that of the surface of the sun. The core temperature is about 6880℃, and the surface temperature of the sun is about 6000℃. The highest temperature of the earth erupts in lightning. One lightning can release energy of 1000 billion joules, reaching 30,000℃, which is five times the temperature of the sun's surface, but its temperature can never be compared with that of the sun's core, which is about14,000,000℃.

But the earth also has the coldest places. Oymyakon in eastern Siberia in the northern hemisphere and the Antarctic continent in the southern hemisphere are the coldest places in the world.

The interior of the earth consists of layers of different states and different substances, including the crust, mantle and core from the outside to the inside. Do you know how high the temperature inside the earth is? The thickness of the earth's crust is about 8 to 40 kilometers. In a place not too deep below the surface, you can use y = 35x+t to calculate the temperature, where x (km) is the depth, t(0C) is the surface temperature, and y(0C) is the reached temperature. The mantle is about 2900 km thick and the temperature is about 900~22000C C. The core is divided into two parts: the outer core is about 2,300 km thick and the temperature is about 2200~50000C C. The inner core is about 1300 km thick and the temperature is about 50,000 C. Strangely, however, in the outer core, the matter is in a molten state, while in the core.

The core temperature is between 4000-6800℃. The outer core is mainly composed of liquid or molten iron, nickel, silicon and other tissues. Because of the existence of shear waves, the inner core is considered to be solid. The whole core accounts for 3 1.5% of the earth's mass.