faster than light travel is impossible, and I am firm in this belief. If interstellar travel was possible, we would have seen some evidence by now. And we still haven't figured out how the human body could withstand the rigors of space travel. Mars is a realistic goal, though probably a one way trip.
1) According to the math, FTL travel
is possible. The problem is getting to FTL without passing through the speed of light. Travelling
at the speed of light is, of course, impossible. But traveling faster? Possible.
2) The statement "... we would have seen some evidence...", that one I can accept. It's worrisome that we've seen no evidence of ramjets and the like. Of course, maybe that's because:
3) We can in theory travel to the stars
now by using slowboats. The problem is that slowboats are
enormously hard to build; we've failed at every simulation attempt so far. If there
is a viable FTL drive, a ship using it is probably
easier to build than a slowboat.
The above doesn't take into account sailing ships;
those, we wouldn't see much evidence of. They still fall under the general heading of slowboats, though.