Atomic clocks: The science of perfect time

3-Second Blueprint (English)

1. Conventional atomic clocks tune microwaves to cesium electron energy transitions, keeping GPS and global financial networks synced.
2. Laser-probed ytterbium optical clocks tick nearly 60,000 times faster than cesium, losing under a second across cosmic history.
3. Portable optical clocks could sharpen spacecraft tracking, detect relativistic spacetime shifts, and test fundamental physics.