you are assumunig we know all there is to know about science, and out propulsion systems are the only thing possible. This is far from true.
YOUR assumption of what I was saying is UNTRUE. You assumed most incorrectly. You OBVIOUSLY thought I WOULD indeed say something so STUPID as "we know all there is to know about science." I never did say that or even INFER it. In fact YOUR assumption was STUPID.
And I did NOT ever mention "out propulsion systems."
LEARN to read.