Sunlight Story (1)

Editor : Optomon

This is the energy source of the sun.

 The sun is overwhelmingly large celestial body in our solar system. The sun was formed about 4.57 billion years ago, is estimated to have a lifespan of about 12.37 billion years. The sun is overwhelmingly large celestial body in our solar system. Mass also accounts for 99.86% of the total mass of the solar system. Compared to earth, the equatorial radius of the Sun is 696,000 km, 109.13 times that of earth. Also, the mass of the Sun is approximately 1.988 × 1030 kg, 332,946 times that of earth.

*Reference : small entrance

Sun Structure

 Core pressure of the Sun is very high and its temperature is about 16 million ℃ because the Sun is extremely heavy. It is called “Solar Core”. In the range of approximately 15 km of radius from the center of the sun, multiple atomic nuclei of hydrogen fused into larger nucleus. This is called ‘nuclear fusion’. When the nuclear fusion occurs, a large amount of heat and light is generated. This is the energy source of the sun.

It takes about 8 minutes and 20 seconds for the sunlight to reach the Earth.

 It takes from millions of years up to 10 million years for the light generated by nuclear fusion at the Solar Core to reach the surface of the Sun. The sunlight reached to the surface of the Sun is released into space and it takes 8 minutes and 20 seconds to reach the Earth.

 Majority of energy which the Sun produces is released into space as light (Electromagnetic Wave). Earth is far away from the sun and much smaller than the sun, the amount of sunlight which reaches to earth among entire sunlight released from the sun is just one over 22 billion.

 However, the energy of sunlight which arrives to earth for just 20 seconds can supply enough energy which is used by all of human civilization.

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Spectrum of Solar Radiation (Earth)

Interesting solar energy story~~

1. If solar panels installed in the area of 700km2 in the Sahara, it can supply enough energy to be used by all of human civilization.

2. If solar energy poured on earth collected for one hour, whole world can use it for one year.

3. With amount of solar energy released from the Sun for just one second, all mankind can use for one million years.