Our Deep Space Atomic Clock, like a GPS for navigating the solar system, is a NASA Technology demo launched in June 2019. The mission has been extended through August 2021, so its team can continue testing and improving the clock's stability: https://go.nasa.gov/3dxS9U0 | NASA - National Aeronautics and Space Administration

NASA has perfected new navigation technology that would make self-driving spacecraft and GPS beyond the Moon a reality. The Deep Space Atomic Clock is the first atomic clock small and stable enough to fly on a spacecraft beyond Earth's orbit. As NASA works to put humans on Mars and the Moon, the clock’s precise timekeeping will be key to these missions’ success. | NASA Jet Propulsion Laboratory