The daring idea that time is an illusion and how we could prove it The way time ticks forward in our universe has long stumped physicists. Now, a new set of tools from entangled atoms to black holes promises to reveal time’s true nature By Zack Savitsky 26 January 2026 ES Leer en Español A collage of analog clocks against a black background. Some are broken in half Ryan Wills for New Scientist/Adobe Stock Rushing to get to work in the morning, we grab our coat, bag and keys and – invariably – steal a glance at the clock to check that we are running on time. The passing of time is so integral to our day-to-day lives that we can’t afford to ignore it from one hour to the next. So far, so completely obvious. Yet if we pause to ask what physics has to say about why time flows at all, we find it struggles. Albert Einstein’s ideas warped time, quantum theory barely considers it, and no other facet of modern physics can satisfactorily explain it. “It’s one of the biggest mysteries of science,” says Natalia Ares at the University of Oxford. Now, though, one of the most audacious proposals for how time really works is getting a second look. Back in the 1980s, physicists sketched out the hypothesis that time is an illusion, conjured from an essentially timeless universe by the strange workings of quantum mechanics. Back then, this idea, known as the Page-Wootters mechanism, impressed many – but it was beyond any experimental test. Forty years later, however, new research into the working of clocks is showing how we might finally probe this elegant proposal and revealing the mysterious role that black holes may play in the ticking of time. Read more Is gravity a new type of force that arises from cosmic entropy? If you were to survey the laws and equations of modern physics, the only clue that time flows in just one direction would come from the second law of thermodynamics, which states that entropy, a measure of disorder, tends to increase. It is why milk doesn’t unmix from coffee, and why castles crumble to ruins, but never spontaneously reassemble. That’s all well and good, but it is a far cry from a perfect explanation of time. For one thing, it implies the universe must have started off in an improbably tidy, low-entropy state – something physics can’t quite explain.