Our universe might be one of 10^500 possible realities

Science · Published 25 October 2026 Swipe more like this →

In short: The fundamental constants of our world—like the mass of a quark or the strength of electromagnetism—seem perfectly tuned for life. But physics currently cannot explain why they are these specific numbers. This mystery leads to a startling possibility: we might just be one version in a nearly infinite multiverse.

The Standard Model of particle physics is our current best map of the subatomic world, explaining chemistry, magnetism, and nuclear physics. However, it has a significant limitation: it fails to predict 19 specific parameters. These include the masses of six quarks and three leptons, the mass of the Higgs boson, and the strengths of various fundamental forces. Currently, these values are not derived from first principles; they must be measured experimentally and manually inserted into the model as constants.

This lack of prediction creates a 'fine-tuning' problem. If these numbers were even slightly different, our universe might be unrecognizable or incapable of supporting life. Because there is no underlying theory currently explaining why these constants are what they are, some physicists point toward the multiverse. In this view, every possible variation of these numbers exists somewhere in a vast collection of universes.

M-theory, which unifies various versions of String Theory, provides a mathematical framework for this idea. It suggests that strings are one-dimensional slices of two-dimensional membranes vibrating in an 11-dimensional spacetime. Calculations based on this theory estimate the number of possible multiverses to be as high as 10^500. While critics argue the math is so complex it can represent almost any imaginable universe, theorists suggest these extra dimensions might be 'compactified' into tiny, complex shapes like Calabi-Yau manifolds.

The geometry of these hidden dimensions determines how strings vibrate, which in turn dictates the particles and forces we observe. If we could identify the specific shape of these manifolds, we might finally understand the theoretical basis for our universe's constants. Scientists are currently attempting to test for the existence of these extra dimensions using the Large Hadron Collider.

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