Physics is by far the most important and relevant scientific discipline to the study of the universe and everything in it. In fact, in modern times the terms “astronomy” and “astrophysics” are often used interchangeably. That said, all sciences are important to astronomy, and some disciplines that are not very relevant now may someday be extremely vital. For example, if astronomers eventually find extraterrestrial intelligent life, psychology and sociology could become important to the study of the universe as a whole.