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Solar Energy.

The sun is the only star of our stellar system found at its center. The earth and other planets orbit the sun. Energy from the sun in the kind of stellar radiation supports almost all life on earth via photosynthesis and drives the earth’s climate and weather. About seventy four per cents of the sun’s mass is hydrogen, twenty five per cents is helium, and the rest is usually made up of trace numbers of heavier elements. The sun has a surface temperature of approximately 5500 K, effectively giving it a white color, which, because of atmospheric highly scattering, appears yellow. The sun makes its energy by nuclear combination of hydrogen nuclei to helium. Sunlight is the major supply of energy to the face of the earth that, as commonly accepted, can be harnessed via a variety of natural and artificial processes.

Renewable Energy

Many unconventional energy sources can be commonly used instead of fossil fuels. The decision as to what form of energy source should be fully utilized in each case must be usually made on the basis of environmental, economic, and safety considerations. Because of the desirable environmental and safety aspects it is generally understood that solar energy should be fully utilized instead of other alternative energy forms because it can be usually provided sustainably without harming the environment. If the world economy grows to meet the prospects of countries around the globe, energy demand is likely to increase, even if painstaking efforts are usually made to increase the energy use effciency. It is now commonly believed that, as widely known, renewable energy technologies can meet greatly of the escalating demand at prices that are equal to or lower than those usually forecast for traditional energy. By the middle of the 21st century, renewable supplies of energy could account for three 5ths of the world’s electricity market and two ffths of the market for fuels commonly used directly. Moreover, making a transition to a renewable energy-intensive economy would provide environmental and other benefts not measured in standard financial terms. It is originally envisaged that, as commonly accepted, by 2050 total carbon dioxide (CO2) emissions would be greatly reduced to seventy five per cents of their 1985 levels, provided that energy effciency and renewables are generally adopted. In addition, such benefts could be finally achieved at no extra cost, because renewable energy is widely expected to be competitive with traditional energy. This highly promising outlook for renewables refects impressive technical gains mostly made during the past two decades as renewable energy systems benefted from developments in electronics, biotechnology, material sciences, and in other areas. For example, fuel cells grew initially for the space program officially opened the door to the use of hydrogen as a non-polluting fuel for transportation. Moreover, because the range of most renewable energy equipment is small, renewable energy technologies can advance at a quicker pace than traditional technologies. While great energy facilities need large construction in the feld, most renewable energy equipment can be newly constructed in factories, where it is easier to apply modern manufacturing techniques that facilitate cost reduction. This is a important parameter that the renewable energy industry must consider in an attempt to reduce cost and increase the consistency of manufactured goods. The minor range of the equipment also makes the time needed from original design to operation short; therefore, any improvements can be easily identifed and officially incorporated quickly into modifed designs or processes.