Capt Quirk
Veteran
Yeah, like that 
Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
I remember hearing stories, ones I can't prove, but the Nazis and the US both had some sort of flying saucer design aircraft in WWII.
That is theory and pop science fiction. While Steven Hawkings is rumored to not only be a Trekkie and working on a warp engine, it may not be possible. To assume that another race is that much more advanced, is also conjecture. Maybe they just got lucky and learned of a dimensional doorway. They are seen in the skies, but rarely in Space. But again, there have been some Astronaut/UFO claims.The thing is, the real ones wouldn't, according to anecdotal evidence use jets or fans or other conventional (present-day, that is) means of propulsion.
Plasma propulsion and gravity-disrupters are two commonly held concepts for how a real spacecraft might function.
e
To assume that another race is that much more advanced, is also conjecture. Maybe they just got lucky and learned of a dimensional doorway.
Postmaster- I saw an animated feature being done, that follows a story of the Nazi's going to the moon in Saucers in the 1940's and built a huge base. Then in the near future come back to try again. I wish I could remember the name of it.
Well, if you use the Drake Equation:
N = R* x fp x ne x fl x fi x fc x L
and using THE most upto date values available:
N = (7 × 0.5 × 2 × 0.33 × 0.01 × 0.01 × 10000) = 2.3
2.3 thats how many possible civilizations are "out there", since we are one of them its actually 1.3...
No, I had absolute no reference, could be like a big Boing or the size of that one in Independence Day - depending on hight.
I have no clue, not even sure if it was solid - just the absence of light with that refracting effect on the rim.
Sorry, Frank