From Robert Peck, York, UK
The idea of a slower-than-light warp drive is interesting (6 March, p 16). But I wonder if any civilisation with the resources necessary to fabricate a spaceship’s shell compressed from something that was Earth’s mass, and then accelerate it, would find it easier to achieve time dilation by the still complex, but slightly more practical, method of a low-mass vessel propelled as close as possible to the speed of light?
