" But what makes you so sure about faster than light speed capability being impossible. What are you basing that opinion on? Where's your evidence to provide such certainty?"

Ummm..Little Hawk, old boy..do you READ my posts in detail? Or do you just skim them, note a few lines, remember that I am likely to not be a 'believer' and POUNCE? I said nothing about being sure of impossibility!
   My exact quote was "...and I will withhold opinion on FTL drives."
Meaning, I don't see any scientists explaining HOW FTL might happen.

My earlier quote was ""FTL drives" and "wormholes" are great fun for Sci-fi, but like all notions of interstellar travel, the power sources are just as vague."

That is the way skeptics talk! And when you ask ME to provide 'evidence' of MY certainty, you have it backwards. I am very carefully uncertain! I am not making a claim..YOU are. I am **doubtful** of your claim that "aliens are here", and by implication, that FTL must exist.

Geez...I seem to spend as much time correcting the form of the argument as debating the points!