Astronomy is a scientific pursuit that is focussed on the skies above our heads. All aspects of the heavens fall under the scope of astronomy, from star gazing to the study of meteors and other planets. Generally speaking, it is viewed as a multi-disciplinary science which takes in aspects of mathematics, physics, chemistry and – in some cases – geology. Astronomy should not be confused with cosmology which is the study of the entire universe. It is, therefore, a branch of astronomical research, but not the same thing. These days, some very advanced theories – including quantum physics – are used to explain astronomical phenomena.