Is it possible to build a vehicle that can accelerate to .99 C? How would we go about doing something like this? If at all possible, how many centuries or millennia is it before this can be accomplished? Could a Bussard scramjet do it? How large would a laser/maser/gaser have to be to get the craft up to such speed? How long would it take from the crew's perspective to cross the galaxy? How big would the craft be? I imagine a lot of fuel would be required even if you could gather propellant along the way - Bussard scramjet. What kind of fuel would be needed? Would such a vessel help establish a galactic civilization? Or would time dilation make implausible? What would it look like? Are any sort of warp drives completely impossible? If so, which of the following would best for interstellar travel: beamed propulsion, matter/antimatter reaction, Bussard scramjet, or something else?