Solar energy is the energy that is in (1)_________________. It has been used for thousands of years in many different ways by people all over the world. As well as its traditional human uses in heating, (2)_________________, and drying, it is used today to make electricity in the places where other power supplies are absent, such as in remote places and (3)_________________ space. It is becoming (4)_________________ to make electricity from solar energy and in many situations it is now competitive with energy from coal or oil. A solar cooker can be used for cooking food.