Physics involves the study of nature—the attempt to understand its fundamental laws and to describe natural phenomena quantitatively. Physicists are interested in everything from the very large (the universe itself) down to the extremely small world of elementary particles.
In physics, you study a huge range of phenomena: black holes, the formation of stars, the structure and properties of materials, and the behavior of quarks inside subatomic particles. Physics also provides the practical knowledge that underlies much of technology, creating an exciting interplay between new discoveries and the development of new devices, such as the laser, MRI medical systems, superconductors, and more.