A company founded by former NASA astronaut Franklin Chang-Diaz has been developing a new rocket engine that draws upon electric power and magnetic fields to channel superheated plasma out the back. That stream of plasma generates steady, efficient thrust that uses low amounts of propellant and builds up speed over time.
The trip to the Red Planet typically takes half a year. A mission study confirmed that with this new rocket engine and an appropriate power source, the journey could really happen in just over a month.
http://www.huffingtonpost.com/2010/03/09/mars-in-40-days-new-rocke_n_491346.html
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