Cosmology is the science that studies the universe, the cosmos. Cosmos is a word used in earlier Greek metaphysical thought that means ‘harmony’ or ‘order’, as opposed to chaos. In one Greek theory of creation, chaos is the formless matter from which the cosmos, or harmonious order, was created (EP: ‘Cosmology’, II: 237–244; ‘Chaos and Cosmos’, II: 80–81). And time is one of the most fundamental issues in philosophy and cosmology, since the whole of existence is nothing but consecutive series of events in time. Everybody feels time, but most people do not question it because it is commonly experienced every day in many things and is so familiar. However, it is far more difficult to understand the philosophical nature of time and its characteristics.