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"Plasma propulsion may very well be our ticket to visit those little  green men on Mars, which is why NASA is becoming besties with Ad Astra,  makers of the VASIMR VX-200  plasma rocket.  After successful terrestrial testing, the next step is  to try out a VF-200 flight model in space -- and a new agreement gives  NASA engineers access to VASIMR while letting Ad Astra leverage NASA's spacecraft expertise to get it into orbit. The plasma rocket was assumed to be destined for use on the International Space Station  because it requires far less fuel than conventional boosters -- making  it better suited than the propellant-hungry thrusters keeping the  station in orbit today -- and can take advantage of the ISS's  considerable electrical power (250kW) to fully test VASIMR's 200kW  output. Plasma rockets produce sustained thrust, as opposed to the quick  bursts of its chemical cousin, which makes it the preferred means of  propulsion for space travel as well. NASA hasn't fully committed to  either use -- but if Marvin and his fellow Red Planet denizens know  what's good for them, they'll be watching VASIMR's development with great interest."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2011/03/11/nasa-and-ad-astra-team-up-to-test-vasimr-plasma-rocket-in-space/>