Now some researchers think our universe might be moving into a fifth dimension, and that behavior of dark energy is evidence for this dimension. The problem is that our math says dark energy should be enormous, but our telescopes show it’s incredibly tiny. They call it the “Dark Dimension” scenario. The tiny value of dark energy we observe is actually a signal—a breadcrumb trail—pointing directly to the existence of this hidden, micron-sized dimension. The dark dimension might be a mirage, or it might be the foundation of everything.