How high is the sky from the ground?

The height of the sky is the thickness of the atmosphere. First of all, we must clarify a concept. The earth's atmosphere, for the earth, is only a very shallow layer, which cannot be compared with the radius and diameter of the earth. As we know, the earth is an ellipsoid with an average radius of 63,765,438+0 km. If the thickness of the atmosphere is several thousand kilometers, it is not an order of magnitude, but equal. The atmosphere is just a layer of air in the earth's crust. About 5 kilometers from the ground, the air quality is only half, and about 20 kilometers from the ground, the air quality is only 5% of the ground. It can be seen that the higher the air distribution in the atmosphere, the thinner it becomes. Most of the weather phenomena we see in the sky, such as clouds and rain, appear in the atmosphere below the ground 12 km. We call it the troposphere. The ozone layer in the upper air is 35 kilometers to 80 kilometers from the ground, and the air becomes ions, so it is also called the ionosphere, which is the atmosphere where radio waves spread. By 200 kilometers, the air had escaped into space. The polar-orbiting satellite launched from the ground, only 300-500 kilometers away from the ground, has got rid of the gravity of the earth. Geosynchronous satellite is required to be in a higher space, more than 30,000 kilometers above the equator of the earth. The atmosphere includes the gas layer of the earth. All or part of it is often called "atmosphere" or "atmosphere". It consists of nitrogen, oxygen, argon, neon, helium, krypton, hydrogen, ozone, water vapor, carbon dioxide and other gases. The bottom boundary of the atmosphere is the ground. The higher the atmosphere, the thinner the density, and finally the transition to interstellar space is extremely thin. At present, the upper atmosphere is mainly bounded by magnetosphere. The side facing the sun has a lower magnetospheric top than the side facing away from the sun. Generally, the height of the magnetospheric top facing the sun (about 10 radius of the earth from the center of the earth) is regarded as the upper atmospheric height, which is about 57,600 kilometers from the ground. The total mass of the atmosphere is about 5.14×10/6 kg (about one millionth of the total mass of the earth), of which 50% is below 6 km and 99.9% is below 50 km. The thickness of the atmosphere that has a direct impact on the ground weather is about twenty or thirty kilometers. According to the characteristics of temperature change, component mixing state, ionization state and chemical reaction distribution with height, the vertical direction of the whole atmosphere is divided into several levels. See "Atmospheric Stratification" for its stratification. Reference: Ci Hai