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Well, we have seen movies (not saying those spacecraft are what they look like) and most of them have the general saucer shape or rounded edges or whatnot. Take a look at the stealth bomber or the SR-71 and if you have never seen it before and never knew we had anything like it, it looks generally like a spacecraft.
This is just our interperetation of what something would look like. We don't really know what Aliens look like but we make our own. Big head, bug eyes and kinda short and lanky. Or we could go with the Predator/Alien/Species style alien and make him look really weird and messed up.
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