Life on earth is fueled by the light and heat from the sun. The total amount of solar energy that strikes the earth is about 3850 zettajoules (ZJ) per year. Though the frequency range is different, the suns energy travels via electromagnetic radiation similar to that of radio waves. Much of this solar energy will be absorbed by the air, mostly turned into heat and light. Solar energy has many advantages over conventional energy. The energy from the sun is free the only expense is from recovering