The silly thing is that there is absolutely no reason for the saucer shape in space i.e. the wide circular ring has no aerodynamic use and is a total waste of unnecessary materials. The concept of the saucer shape has many earlier origins ...
http://www.greyfalcon.us/An%20Aerona...%20Saucers.htm
It is always amusing that aliens from outer space are given such anthropomorphic features. There is really no reason they should look anything like us (assuming any exist).
Regards, Rob