Planet walk

The Prairie Ridge Ecostation has a new "planet walk."  It starts with a sign for the sun and then at a proportional distance it has signs for each planet.  The first four are fairly close.  (in the picture the sun is on the left in front and then Mercury, Venus, Earth and Mars are in order down the path.)  We had  to walk pretty far to get to Jupiter and Saturn.  We thought that the sign for Uranus was missing but found it way down the path.  Neptune was clear across the park.  Poor Pluto doesn't even make the list anymore.