Energy is one of the most fundamental parts of our universe. We use energy to do work. Energy lights our cities. Energy powers our vehicles, trains, planes and rockets. Energy warms our homes, cooks our food, plays our music, gives us pictures on television. Energy powers machinery in factories. Energy is defined as "the ability to do work." When we eat, our bodies transform the food into energy to do work. When we run or …showed first 75 words of 2557 total…

…showed last 75 words of 2557 total…there would be no life on earth without the sun, which provides energy needed for the growth of plants, and indirectly, the existence of all animal life. The solar energy scientists are interested in is energy obtained through the use of solar panels. Although the field of research dealing with this type of solar power is relatively new, bear in mind that man has known about the energy of the sun for thousands of years.