area of research into quantum measurement and optomechanics. Note: Gravitational waves are ripples in the curvature of spacetime caused by huge cosmic events like the Big Bang and the collision of black holes. Timeline from the Big Bang to the present The Timeline of the Universe in the Cosmology Gallery tells the story of the creation of the universe – from the Big Bang right through to the present. It shows all the different stages of development and evolution of planet Earth. There are stories, as well as real fossils to look at on the Timeline. This display asks visitors to consider questions regarding themselves and the Universe they live in. Penrose Floor Attempting to tile a plane with regular pentagons must necessarily leave gaps. Mathematician Roger Penrose found a particular tiling in which the gaps may be filled with three other shapes: a star, a boat, and a diamond. In addition to the tiles, Penrose stated rules, usually called matching rules, that specify how tiles must be attached to one another; these rules are needed to ensure that the tilings are non-periodic. There are three distinct sets of matching rules for pentagonal tiles, shown in different colours in the illustration. This leads to a set of six tiles: a thin rhombus or “diamond”, a five-pointed star, a “boat” and three pentagons. Astrophotography The Australian Shaman Exhibition – Indigenous Australians’ connection to and understanding of the night sky, including many artworks depicting the stories told to explain what they observed. Coherence to Chaos Exhibition Multicultural artwork Southern Cross Cosmos Centre, home to the GDC Observatory The Zadko Telescope, a robotic optical telescope. The Solar System Walk The Solar System Walk is an educational 1km scale model of the Solar System. The walk begins at the Sun and disappears along a track through native bush. Alongside the track, model planets and their moons are located at the correct scaled distances from the Sun. Information plaques are located at each planet. The walk finishes at Pluto, although Pluto is now defined as a dwarf planet, rather than a planet. On the 1km scale model, the relative size of the Earth should be about the size of a peppercorn. And Saturn should only be the size of a peanut or a coffee bean, Mercury should be the size of a cake freckle, Jupiter should be almost the size of a golf ball and