Nasa's advanced ion propulsion rocket engine has run continuously for over five and a half years, setting a new world record.
This makes it the longest test duration any kind of space propulsion system demonstration project ever.
The solar-electric propulsion thruster could be used in a wide range of science missions including intriguing journeys into deep space.
The thruster is part of the space agency's Evolutionary Xenon Thruster (NEXT) project at its Glenn Research Centre in Cleveland.
This is fine for puttering around in near Earth space, but not for much else. To read more, click here.