1 Iridium NEXT satellite
A demonstration unit of the Deep Space Atomic Clock (DSAC) was hosted on board an Iridium NEXT satellite, the second generation of satellites for the Iridium satellite phone system.
2 Small-scale
A fraction of the size of its lab-based counterparts, the DSAC was just 0.0056 cubic metres (0.2 cubic feet) – smaller, lighter and more stable than any other atomic clock in space.
3 Signal comparison
Ground stations around the world took measurements
