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This session will be an exploration of the edges of the Universe, and the edges of knowledge. There are things that we cannot in principle observe. Are there things we cannot in principle know? Which is the most fundamental limit: the small and large edges of space, the edges of time, the edges of knowledge, or something else? Chair Associate Professor Tamara Davis The University of Queensland Mentor Professor Brian Schmidt AC FAA FRS The Australian National University The edge of the Universe—a fundamental limit how much we can know? - Associate Professor Tamara Davis The small-scale spatial limits to the Universe - Dr Alessandro Fedrizzi The edge of time: What happened at the big bang? - Dr Luke Barnes The edges of knowledge —the ‘physics is done’ syndrome - Associate Professor Michael Murphy