Scientists Discover Universe's Laws Sit in Perfect 'Sweet Spot' for Life to Exist

Scientists at Queen Mary University of London have proposed a striking discovery that links the deepest laws of physics to the very existence of life itself. Their groundbreaking research suggests that the Universe's fundamental constants sit within an extremely narrow range that allows liquids to flow in ways that living cells absolutely depend on. If those constants were even slightly different, water, blood, and other life-supporting fluids could behave so dramatically differently that complex organisms might never have emerged at all.

The study, published in Science Advances, builds on earlier work by physicist Kostya Trachenko and colleagues showing that liquid viscosity is tied directly to fundamental physical constants. That finding established a lower limit for how "runny" liquids can be. The newer research extended this concept into biology, asking whether the same physical rules that shape the cosmos may also quietly determine whether cells can function. Professor Trachenko explained that "understanding how water flows in a cup turns out to be closely related to the grand challenge to figure out fundamental constants."

Life depends critically on movement at microscopic scales, where nutrients must travel through cells, proteins need to fold correctly, and molecules constantly diffuse through watery environments. All of this relies on viscosity, the property that determines how easily a liquid flows. According to the researchers, the Universe appears to operate within a surprisingly narrow "bio-friendly" window where viscosity and diffusion remain suitable for life. If the constants governing physics shifted by only a few percent, liquids essential to biology could become dramatically thicker or thinner.

The consequences would extend far beyond drinking water or oceans, affecting human blood, cellular fluids, and the fundamental chemistry that powers life. "Any change in fundamental constants including an increase or decrease would be equally bad news for flow and for liquid-based life," Trachenko noted. "We expect the window to be quite narrow: for example, viscosity of our blood would become too thick or too thin for body functioning with only a few percent change of some fundamental constants such as the Planck constant or electron charge."

This research adds a new dimension to the long-standing debate among physicists about why the Universe's constants appear finely tuned. Previous work has shown that tiny differences in values such as the electron charge or the strength of fundamental forces could prevent stars from forming heavy elements needed for planets and life. The new findings suggest that even if stars and planets formed, life might still be impossible if the fundamental constants didn't allow for proper liquid behavior at the cellular level.