The ANU Planetary Science Institute (PSI) is a joint venture of the Research School of Astronomy and Astrophysics (RSAA) and the Research School of Earth Sciences (RSES).

In 1995, the first planet orbiting a sun-like star other than our own was discovered. Over 200 extra-solar planets are now known. The research mission of the PSI is to capitalise on the strength of the RSAA and RSES to increase our cross-disciplinary understanding of the life cycle and diversity of planets, through discovery and the critical study of the formation, evolution, and fate of planetary systems throughout the Milky Way, including our own Solar System.