Without the sun, there would be no ()?

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The sun, or the sun, is a star in the center of the solar system, and it is almost an ideal sphere where hot plasma and magnetic field are intertwined. Its diameter is about 1 392,000 (1.392×106) km, which is equivalent to 109 times the diameter of the earth. The mass is about 2× 10 30 kg (330,000 times that of the earth), accounting for 99.86% of the total mass of the solar system. From the chemical composition, about three-quarters of the mass of the sun is hydrogen, and the rest is almost helium, including oxygen, carbon, neon, iron and other heavy elements with mass less than 2%. On 2016 65438+1October 15 local time, the Solar Dynamics Observatory of NASA released a time-delayed video with a duration of about 6 minutes, which fully showed the activity track of the sun.

Apart from atomic energy, volcanoes and earthquakes, solar energy is the total source of all energy on the earth. So, how much did the whole earth receive? The sun emits a lot of energy? Scientists imagine putting an instrument to measure the total solar radiation energy outside the earth's atmosphere. The total energy of solar radiation received per square centimeter per minute is 8.24 Joules. This value is called the solar constant. If the sun constant is multiplied by the spherical area with the radius of the average distance between the sun and the earth, the total energy emitted by the sun per minute is about 2.273×10.28 Joules per minute. The heat radiated by the sun into space every second is equivalent to the sum of the heat generated by the complete combustion of 1 100 million tons of coal, which is equivalent to the power of a 520 trillion horsepower engine. Every square meter of the sun's surface is equivalent to a power station with 85,000 horsepower. ) and the earth only receives 2.2 billion of these energies. The energy that the sun sends to the earth every year is equivalent to 654.38+000 billion kWh. Solar energy is inexhaustible and pollution-free, and it is the most ideal energy source. 1239, prominence was mentioned in Russian chronicles, called "flame tongue", and was rediscovered in a solar eclipse in 1842. 1843, Schwabe discovered the cycle of solar activity 1 1 year. In 185 1 year, the first photo of the corona was taken during an eclipse. Solar flare was discovered in 1859.