immense energy cost / enormous energy budgets / candidate technologies / environmental recycling machinery / energy rocket / energy consumption / maximum energy efficiency / kinetic energy / zeropoint quantum energy / futuristic technology / chemical rocket propellants / energy budget climbs / mining / energy use / huge kinetic energy / energy expense / robotic systems / raw energy / energy usage / energy / /
Person
John S. Lewis / Marshall Savage / Frank Drake / Stephen Ashworth / Stephen Ashworth Oxford / Dava Sobel / /