Scientists Just Built the Most Accurate Clock Ever Made

[00:00:00]Your phone's clock is [music] already insanely accurate. Scientists just said, "Not accurate [music] enough."

[00:00:07]Every clock you've ever used, atomic clocks included, runs on electrons buzzing around an atom.

[00:00:13]But electrons get knocked around [music] by stray electric fields, magnetic noise, vibrations.

[00:00:20]So physicists went deeper.

[00:00:22]Straight into [music] the nucleus. They found one atom, t h o r i u m 229, with a nuclear transition so low [music] energy a laser can actually hit it.

[00:00:33]That's never been possible for any other nucleus.

[00:00:37]>> [music] >> The nucleus is locked away inside the atom, shielded by all those electrons.

[00:00:42]Hit it with [music] the right UV laser and you get a clock almost immune to the noise that limits everything before it.

[00:00:49]This isn't just [music] a better stopwatch. It's a tool that could catch dark matter or detect the universe's constants quietly drifting. They just [music] turned it on for the first time.