Australia Is Building a Pee-Powered Ion Thruster

Our current level of technological prowess is severely hindering efforts to explore the solar system. Nine months to get to Mars—who's got that kind of time? If a new breed of ion thruster currently under development at the Australian National University is successful, we'll get to the Red Planet in a third of the… » 6/13/12 1:20pm 6/13/12 1:20pm