Solar thermal heating is known as one of the energy source of human daily life. The sun is needed by not only human, but also the entire living on the earth. There are many things that human don’t realize about the solar energy. These things will make you thank the God for completing this universe with sun. Researchers said that solar thermal heating is the main source of energy that makes we are alive today. This energy is a kind of totally free along with few other energy sources. The light of the sun speeds across the distance between earth and sun, approximately 90 million miles away, only in 10 minutes.