The Sagan Planet Walk in Ithaca, New York, is one mile long from the downtown
commons to the Sciencenter. It is an educational tribute to Carl Sagan, Cornell
professor, long-time Ithaca resident, and science popularizer.
http://www.sciencenter.org/saganpw/The Sun model in the commons is a hole in the top of the monument about the
width of a basketball. By comparison, Pluto and Charon are barely visible dots.
http://geology.about.com/library/weekly/aa081802a6.htmThe moon stats for Jupiter through Pluto are in serious need of updating, as the
SPW was dedicated in 1997. And I'm not quite sure what they're going to do
in regards to those really big KBOs and TNOs they keep finding.
One other fact about the SPW that always gets people is that they plan on
dedicating a plaque marking the scaled location of the nearest star system,
Alpha Centauri. It is to be located in Hawaii.