Physicists with nothing better to do speculate on the devastating effects of a fictional star-drive: Warp Drives May Come With a Killer Downside Repeat after me: "Computer models are not data." At our current level of understanding, star-drives are likely to be the most powerful weapons ever. I think it was one of Niven's Man-Kzin stories where a "primitive" starship from Earth is approached by more technically advanced aliens out in deep space. The Earth captain, commanding an "unarmed" ship, uses his star-drive to blast the aliens to atoms. The first season Space: 1999 episode "Voyager's Return" (one of my favorites) tells how Earth's first interstellar probe accidentally destroys all life on several alien worlds. One day Mankind may travel to the stars, and I don't doubt that the technique will command impressive energies and technologies. However, current speculative designs are probably further from the final result than the writers who imagined flying to the Moon on morning dew lifted by the rays of the sun. But a scientist proclaimed this, so it must be true! Yeah, that worked out well.