You can't see it or feel it, but dark matter makes up 80 per cent of the mass of the universe, and is the glue that holds galaxies together. Even stranger, a mysterious force known as dark energy ensures our universe is ever-expanding, and will eventually drift into a vast dark wasteland utterly devoid of galaxies. What are dark matter and dark energy? How have they influenced our cosmic past, present and future? Come and hear from two leading physicists what these mysteries are, and how the world's biggest telescope, being built in Australia's outback, could solve them.

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