Tethers Unlimited - Use of space tethers for propellantless electrodynamic tether propulsion, pumped tether length propulsion, and transferring energy and momentum from one spacecraft to another. Electric Propulsion and Plasma Dynamics Laboratory - Research in electric propulsion, plasma thrusters and fundamental problems in plasma physics. Princeton University. How Electromagnetic Propulsion Will Work - Illustrated tutorial shows how Goodwin's electromagnetic-propulsion system works and how it could send spacecraft deep into space. Hall Thruster Experiment - Princeton Plasma Physics Laboratory. This site documents the undergoing research in electric propulsions. Mini-Magnetospheric Plasma Propulsion - An advanced plasma propulsion system that will create a large scale magnetic bubble around the spacecraft to ride the solar winds. Electrostatic Propulsion - General concepts and preliminary design for a propulsion system based on Tesla's Wardencliffe technology. UMich Plasmadynamics & Electric Propulsion Laboratory (PEPL) - Researching electric space propulsion with the goal of increased efficiency and better understanding of spacecraft integration issues.