[ianburrell]

Continuous acceleration to relativistic speeds is impossible without magic. Reasonable drives require impossibly enormous amounts of fuel. Antimatter drives require impractically enormous amounts of fuel.

Relativistic speeds require too much energy, too much reaction mass, and too much fuel. None of the reaction drives are good enough. It would only be possible with magic reactionless drive, and magic source of power.

[pfdietz]

Or with beamed propulsion.