Bobrick and Martire suggest instead that a massive gravitational force could be used to bend space time. The trick is finding a way to compress a planet-sized mass to a manageable spacecraft-module size in order to use its gravity. Because of the implied difficulties, a warp drive created from the https://worldlistpro.com/story15525548/5-elementos-esenciales-para-despachador-de-papel-para-manos