The prefix cosmo refers to world and ology is the study of something. Therefore, cosmology is the study of the world. However, it is more than that. Cosmology covers many different sciences including physics and the things and aspects that surround space and the universe and how it affects the earth. It also affects the way the things in space came to be and originated.
Many cosmologists try to discover what is the big bang theory and what caused it. The universe seems to be the core of cosmology. Some famous scientists also learned about and wrote about cosmology including Albert Einstein, Edwin Hubble and Isaac Newton. Hubble may be the one who is closest to cosmology due to his last name. People associate him with the Hubble telescope.
This is an area of study suited to the person who likes to take the wider view! Cosmology is the scientific study of the large scale properties of the universe as a whole. You need a big brain to cope with that! From its earliest moments through its evolution to its ultimate fate; from deep observations of the far reaches of space and time, to spectroscopic analysis.
Where once the curious man would wonder about the physical characteristics of the other side of the world, i.e. the Earth, in cosmology the wondering casts as far as the black holes and beyond. It takes in the current theory of the Big Bang as the origin or the originating spark of our planet.