For one day of the year, Siding Spring Observatory opens its telescopes to the public. It's your chance to take a closer look at the operations of Australia's largest optical telescope site. Tour the telescopes with ANU staff and hear talks by world-famous astronomers. Watch 3D films in the Exploratory Centre and see science displays on the AAT main floor. Enjoy activities for the whole family including local market stalls, solar viewing and much, much more!