No one keeps time quite like NASA.
Last month, the space agency's next-generation atomic clock was joined to the spacecraft that will take it into orbit in late 2017.
That instrument, the Deep Space Atomic Clock was developed by NASA's Jet Propulsion Laboratory in Pasadena, California. On Feb. 17, JPL engineers monitored integration of the clock on to the Surrey Orbital Test Bed spacecraft at Surrey Satellite Technology in Englewood, Colorado.