in 90 days, with 11 days stop-over at Mars. A similar system for use of a particle beam to push a mini-magnetosphere magnetic sail was proposed by Geoffrey A. Landis in 2001 as a possible propulsion system for interstellar travel. Space debris clearance Winglee has also proposed that the technology could be used to help clear space debris in Earth orbit by pushing items of debris out of orbit towards the atmosphere where they could burn up safely. See also List of plasma (physics) articles References External links NASA site Space.com article Spacecraft propulsion Magnetic propulsion devices