Pluto should be the size of a pin head. However, the centre staff have multiplied the size scale of the planets and moons by a factor of 200, to allow visitors to view more practically sized model planets and moons. The Solar System Walk is designed to give an understanding of true sizes and distances in the Solar System, and the vastness of the Universe. During the walk visitors might spot one of the centre's resident kangaroos. Wildflowers are abundant in this area during late winter and spring. As noted above, because Pluto is now considered a “dwarf planet”, visitors will find a replica of Pluto at his final resting place: a satin-lined coffin in the main exhibition area of the GDC. Biodiversity Gallery In the Biodiversity Gallery, visitors can view displays about some of the local flora and fauna. The south-west of Australia is regarded as one of the world's “biodiversity hotspots” with many endemic species that are under threat. Local bushland surrounding the centre is inhabited by some rare and endangered species of plants and animals. The gallery aims to celebrate the rich diversity of plant and animal species in the area. Insect specimens, such as a native bee, have been submersed in resin for visitors to view under the microscope. Samples of local wildflowers are also presented for examination. Biodiversity Walks around the site (often with a guide) enable visitors to view a great diversity of plant species in a short walk. Ancient paperbark trees (Melaleuca sp.), between 800 and 1000 years old, exist in the area beside the Leaning Tower. The Gravity Discovery Centre is located on state government managed land and the surrounding bushland is in its original state, unchanged for thousands of years. The wildflowers provide a colourful display every spring. The bright orange-yellow Morrison shrubs (Verticordia nitens) begin to bloom in November, with the display lasting through to mid-January. However, many other plants and animals can be found all year round. The Leaning Tower of Gingin The Leaning Tower of Gingin is a purpose built tall steel inclined tower, designed so that visitors can recreate the experiments of Galileo Galilei. There are 222 steps to the top from where balloons filled with water can be dropped through chutes. The tower leans at an angle of 15 degrees and held in place by 180 tons of concrete. The drop tower is also used by