** 2021 Open Day CANCELLED due to COVID ** 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! Hear talks by world famous astronomers! Watch 3D films in the Exploratory Centre and see science displays in the AAT main floor! Enjoy activities for the whole family including local market stalls, solar viewing and much , much more! Eat at the Dome Café or grab a sausage on the way round. No booking required - just come on up!