'The Narrabri Stellar Intensity Interferometer' by Stephanie Rossini-Bryson
In the 1960s, on a dusty plain near Narrabri in northern New South Wales, Australia became home to one of the most ambitious astronomy experiments of its time: the Narrabri Stellar Intensity Interferometer. Built by Robert Hanbury Brown and Richard Twiss, this instrument determined the angular diameters of hot main-sequence stars, which helped refine our understanding of stellar lives and temperatures. But beyond its astronomical findings, the story of the Narrabri interferometer is one of persistence and creativity of scientists building world-leading instruments in the Australian bush. It marked a turning point in physics, sparking debates about the nature of light and laying the groundwork for the field of quantum optics. This presentation revisits the creation, achievements, and lasting influence of the Narrabri Stellar Intensity Interferometer. This talk was recorded as part of the 2025 inaugural History of Australian Astronomy Chapter workshop.
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