The School of Physics has played an important role in the development of radio astronomy in particular: Ruby Payne-Scott conducted the first interferometric observations in radio astronomy with the sea-cliff interferometer at Dover Heights; alumnus Ron Bracewell proposed the nulling interferometer to image extrasolar planets, made contributions to the theory of the Fourier Transform and X-ray tomography, and proposed the idea of the Bracewell probe in SETI; and alumnus Bernard Mills led the construction of the Mills Cross Telescope and Molonglo Observatory Synthesis Telescope in the ACT. School of Physics alumnus and Crafoord Laureate Edwin Salpeter discovered the form of the initial mass function of stars, the importance of beryllium-8 in stellar nuclear fusion, and independently with Yakov Zel'dovich proposed the black hole accretion disk model of active galactic nuclei. The Apollo 14 Mission Scientist Philip K. Chapman and the first Australian-born astronaut to fly in space Paul Scully-Power are both alumni of the University. Chaos theory pioneer and Crafoord Laureate Robert May is an alumnus of and former Professor at the School of Physics, best known for his exploration of the logistic map bifurcations. Other famous alumni include Dolph Lundgren. Another notable alumni is srilankan born indian actress Jacqueline Fernandez,who was a student of mass communication and currently she is a successful actress at Bollywood.