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Submission Why Saucers?

An anonymous reader writes: I have a question for engineers. With CNN and MSNBC covering the UFO sighting at an airport, and all other UFO sighting's, a thought popped into my head (We would have to assume that these UFO sightings are real). Can any engineers justify why a saucer shape seems to be the common choice for space travel? Of course I am only looking for theories.

Be careful when a loop exits to the same place from side and bottom.