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Australia's largest optical telescope is the Anglo-Australian Telescope

Australia's largest optical telescope is the Anglo-Australian Telescope (AAT), which is located at the Siding Spring Observatory near Coonabarabran, New South Wales. The AAT has a primary mirror that measures 3.9 meters (12.8 feet) in diameter, making it one of the largest telescopes in the southern hemisphere.

The AAT was built in the 1970s as a collaboration between the United Kingdom and Australia, and it has since been used to make many groundbreaking astronomical discoveries. The telescope is operated by the Australian Astronomical Observatory and is used by astronomers from around the world to study a wide range of astronomical phenomena, including planets, stars, galaxies, and cosmology.

The AAT is equipped with a range of advanced instruments, including the 2-degree Field (2dF) system, which allows astronomers to study the spectra of up to 400 celestial objects at once. It also has a high-resolution spectrograph called the High Efficiency and Resolution Multi-Element Spectrograph (HERMES), which is used to study the chemical composition and evolution of stars.

In addition to the AAT, Australia is also home to other significant astronomical observatories, including the Parkes Observatory, which hosts the largest single-dish radio telescope in the southern hemisphere, and the Australian Square Kilometre Array Pathfinder (ASKAP), which is a cutting-edge radio telescope used for studying the early universe and cosmic magnetism.


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