Tick Tock! Scientists Just Built the Most Accurate Clock in History
Quick Summary
Scientists in Singapore have built the most accurate clock ever made. It uses a rare metal called lutetium. It is so precise it would only lose one second every 300 billion years!
What Happened?
A team at the National University of Singapore built a brand-new type of atomic clock. They published their results in the famous science journal Nature on September 23, 2026.
Most clocks you know — like the one on a microwave — tick by counting seconds. But atomic clocks work differently. They count the tiny vibrations of atoms, which are far too small to see. Atoms vibrate millions of times every single second.
This new clock uses a rare metal called lutetium. Most scientists use other metals like ytterbium or strontium to build atomic clocks. The Singapore team had a hunch lutetium would work better — and they were right.
Here is what makes lutetium special. Temperature and magnetic fields can throw other clocks slightly off. But lutetium barely notices them at all. The team’s leader, Professor Murray Barrett, said the clock would stay steady whether it was sitting in scorching Death Valley or on the freezing Antarctic ice sheet.
To prove their clock really worked, the team built two of them and compared their ticking. They measured together for 200 hours — that is more than eight full days. The two clocks agreed almost perfectly.
How accurate is this clock? Put it this way: a regular household clock might lose a minute every week. A good phone clock might drift by one second every few years. This new lutetium clock would only drift by one second in about 300 billion years. For comparison, the entire universe is only about 14 billion years old. That means this clock would stay perfectly on time for more than 20 times the age of the universe!
Why Does It Matter?
Super-accurate clocks are more useful than you might think. GPS satellites use atomic clocks to figure out exactly where you are. The more precise the clock, the better your GPS works.
Ultra-accurate clocks can also help scientists study gravity. Albert Einstein showed that time passes slightly slower near heavy objects — even two clocks on the same table tick at different rates if one is just a tiny bit higher up. The new lutetium clock is so precise it can actually detect that difference over a height of only five millimeters — about the thickness of your little finger!
Scientists may also use this new clock to help redefine what one second officially means for the whole world.
Big Words
- Atomic clock — a clock that measures time by counting the vibrations of tiny particles called atoms, making it extremely accurate
- Lutetium — a rare, shiny silver metal found in the Earth’s crust, used in this record-breaking clock
- Vibration — a very fast back-and-forth movement, like how a guitar string wiggles when you pluck it
- Uncertainty — in science, how much a measurement might be off from the true answer; lower uncertainty means a more trustworthy result
- Optical clock — a type of atomic clock that uses laser light to measure an atom’s vibrations instead of microwaves
Fun Fact
The universe is about 13.8 billion years old. If you had switched on this lutetium clock at the very beginning of the universe, it still would not have lost even one second by today!
Think About It
If you could measure time down to a tiny fraction of a second, what is one thing you would want to time very precisely — and why?
Sources
- Nature — ‘Lu+ optical frequency references with accuracy verified at the 19th digit’ (Sep 23, 2026)
- EurekaAlert / National University of Singapore — ‘Singapore scientists build world’s most accurate atomic clock’ (Sep 23, 2026)
- Phys.org — ‘Scientists build world’s most accurate atomic clock’ (Sep 23, 2026)
- New Atlas — ‘New atomic clock breaks record for world’s most accurate’ (Sep 2026)
- The Quantum Insider — ‘Singapore Scientists Claim They Built The World’s Most Accurate Atomic Clock’ (Sep 24, 2026)