Traveling to Mars is not easy, which may be why no one has ever tried. It would take a good six to nine months to get there with today’s chemical-fueled rockets. Along the way, according to a 2013 study, you’d get dosed with the radiation equivalent of a whole-body CT scan every five to six days, increasing your lifetime cancer risk above the limits set by NASA. Upon reaching the Red Planet, you’d wait up to two years for Earth and Mars to be at their closest before your return trip, which would last another six to nine months. If the cosmic rays didn’t get you, the long layover might.
But what if there were a better way — a new kind of rocket that could transport you to Mars in less than six weeks? It would drastically cut both travel time and radiation exposure, and instead of three years, ...
