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Scientist eyes 39-day voyage to Mars
Published in The Saudi Gazette on 01 - 03 - 2010

A journey from Earth to Mars could eventually take just 39 days - cutting current travel time nearly six times - according to a rocket scientist who has the ear of the US space agency.
Franklin Chang-Diaz, a former astronaut and a physicist at the Massachusetts Institute of Technology (MIT), says reaching the Red Planet could be dramatically quicker using his high-tech VASIMR rocket, now on track for liftoff after decades of development.
Chang-Diaz's rocket would use electricity to transform a fuel - likely hydrogen, helium or deuterium - into plasma gas that is heated to 19.8 million degrees Fahrenheit (11 million degrees Celsius). The plasma gas is then channeled into tailpipes using magnetic fields to propel the spacecraft. That would send a shuttle hurtling toward the moon or Mars at ever faster speeds up to an estimated 35 miles (55 kilometers) per second until the engines are reversed.
Chang-Diazsaid this rapid acceleration could allow for trips of just 39 days instead of the current anticipated round trip voyage to Mars that would last three years, including a forced stay of 18 months on the Red Planet, as astronauts await an opening to return to Earth. Scaled-down models of the VASIMR craft have been built and tested in a vacuum, under a deal with NASA.


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