Spaceship Earth, the visual and thematic centerpiece of Epcot, weighs 16 million pounds – more than three times that of a space shuttle fully fueled and ready for launch. The outer “skin” of Spaceship Earth is made up of 11,324 aluminum and plastic-alloy triangles. Also, did you know that rainwater never falls off the sphere? It’s channeled into the ball and funneled away.
http://corporate.disney.go.com/media...acts_08_06.pdf