Early departments that have now been spun off into research schools of their own include the departments of Astronomy and Geophysics and Geochemistry. Geophysics and Geochemistry separated into the Research School of Earth Sciences in 1973. Mount Stromlo Observatory became part of the Department of Astronomy in 1957. While part of the school, the Department of Astronomy developed Siding Spring Observatory and installed many new telescopes at Mount Stromlo Observatory. It separated into the Research School of Astronomy and Astrophysics in 1986.