![]() The round window representing the size of the Sun at this station is roughly the size of a basketball and, in this obelisk only, contains no glass. The Sun Obelisk is located in the center of the Ithaca Commons, a pedestrian shopping area in the heart of downtown Ithaca. ![]() Some attendant moons are now represented by tiny holes in the disks. Additionally, as of 2016-2017, the original planets in plexiglass at each station have been replaced by simple yellow disks with the planet simply represented by a relatively-sized hole. However, since the original installation of the Planet Walk the public library has moved to a new location, leaving Saturn no longer attached to a local landmark. All of the original planet locations were chosen not only for accuracy to scale but also to highlight local landmarks and public spaces within Ithaca. Centered within each sun-sized frame, the proportional size of each planet is represented by a small sphere affixed in a glass window. The scaled size of the Sun is given by a 27.8 cm (10.9 in) diameter circular frame repeated at the top of each 6 ft (1.8 m) tall obelisk. In 2015, a grant was approved to further expand the exhibition by installing an exoplanet Kepler-37d station on the Moon 384,500 kilometers (238,900 mi) away. In 2014, the inner planets and Sun were removed as part of extensive construction being done to the Ithaca Commons, but have since been replaced. ![]() The addition of the Alpha Centauri Obelisk made it the world's largest exhibition, until the Akaa Solar System Scale Model added Proxima Centauri in 2018 at a distance of 13,370 kilometres (8,310 mi) away from Akaa. In 2012, the model was expanded 7,630 kilometers (4,740 mi) to include a representation of Alpha Centauri, the Sun's closest neighboring star, at the ʻImiloa Astronomy Center at the University of Hawaii. Ĭonsisting of eleven obelisks situated along a 1.18 km (0.73 mi) path through the streets of downtown Ithaca, the original Planet Walk leads from the Sun at Center Ithaca to Pluto at the Ithaca Sciencenter. The exhibition was originally created in 1997 in memory of Ithaca resident and Cornell Professor Carl Sagan. ![]() The model scales the entire Solar System-both planet size and distances between them-down to one five billionth of its actual size. The Sciencenter's Sagan Planet Walk is a walkable scale model of the Solar System, located in Ithaca, New York. ![]()
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