NASA designing nano-starship which travels at 20% the speed of light
Published time: 12 Dec, 2016 16:50
https://www.rt.com/usa/370057-nasa-star-chip-hawking/
interesting update which includes a 1 hour 15 minutes video presentation by Hawking, Milner et al (note: nano-sized spaceship is not a spaceship having the physical dimensions of a nanometer or a billionth of a meter. It is small, but postage stamp sized - one centimeter or two.)