The solar energy is very important for future to use energy. That is advantages over made from fossil fuels. There are several reasons. First, fossil fuels are limited, but solar energy is unlimited. At that the future, we will not use fossil fuels, because that will be exhaustion. Second, the solar energy is free. Oil and gas prices have increased in the world. Developing counties need a lot of energy to operate factories. They are too heavy a burden that is expensive fossil fuels, but they can get energy easily from the sun. Third, solar energy is clean. Now, air pollution is serious due to a lot of factories, and people, who own cars, have increased steadily in the world. We have to discuss to solution bout air pollution. I think that is solar energy. Finally, people try to develop space science to go to the space. That is human’s dream. In the space the most of problem is energy. That is how to supply space ship with energy. At that the future, space ship can use energy from the sun. In the end, we have to spend money to get solar energy very well, so we can use energy that is clean and free energy for the human.