That junk heap can furnish material to keep your equipment in operation
Propulsion options for the interstellar probe mission
Conceptual Design Issues of a Spinning Tether Orbital Transfer System (STOTS)
A Prototype Bucket Wheel Excavator for the Moon, Mars, and Phobos
NASA's In-Space Propulsion Technology Program: A Step Toward Interstellar Exploration
Electrodynamic Tethers for Reboost of the International Space Station and Spacecraft Propulsion
Integrated active antenna module for space station multiple access communication