Exobiology, also known as astrobiology, is a scientific field which studies the origins, the early evolution and distribution of life as well as its development in the future of the Universe. One of the principal aims of exobiology is to find out if extraterrestrial life exists. The methods of studies which exobiology uses combine those of other fields of science such as astronomy, exoplanetology, molecular biology, biophysics, biochemistry, etc.