An interesting bit of trivia that hasn't been mentioned here yet... The term "Spaceship Earth" was coined by Buckminster Fuller (the inventor of the geodesic dome). If you haven't ever been to Epcot, you might be interested to know that the attraction many people call the "ball" (properly named "Spaceship Earth") is actually a very close resemblence to a geodesic sphere. This makes it quite obvious that the structure of the attraction is definitely intended to pay homage to Mr Fuller.