Solar energy facts. Solar energy is renewable energy source. Read some interesting facts about solar energy.

Sun is ours closest star and directly or indirectly source of almost all available energy on Earth. Sun's energy originates from nuclear fusion in its core, where temperature reaches 15 millions °C. Nuclear fusion is process of joining two light atoms into one heavier atom.

Thanks to nuclear fusion on Sun, every second about 600 million tons of hydrogen is transformed into helium, having 4 million tons of hydrogen transformed into energy as side effect. Solar energy facts:

• The Sun has been producing energy for billions of years now and by current estimations it will continue to do that for next five billions of years. Solar energy is part of energy produced on the Sun that reaches the Earth.
   
• Solar energy can be directly converted into thermal energy or into electrical energy which are useful forms of energy. Electrical energy is most useful form of energy because it can be easily converted into useful work.
   
• Solar energy is “the engine” beyond almost all renewable energy sources. Secondary solar energy powered resources such as wind energy, wave power, hydroelectricity and biomass, account for most of the available renewable energy on earth. Geothermal and tidal energy are not considered as secondary products of solar energy because they exist even without solar radiation.
   

Biodiesel facts. Biodiesel is renewable energy source. Read some interesting facts about biodiesel.

Nuclear energy facts. Nuclear energy is non-renewable energy source. Read some interesting facts about nuclear energy.

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Geothermal energy facts. Geothermal energy is renewable energy source. Read some interesting facts about geothermal energy.