The fate of the universe hinges on the balance between matter and dark energy: the fundamental ingredient that drives its accelerating expansion. New results from the Dark Energy Spectroscopic Instrument (DESI) collaboration use the largest 3D map of our universe ever made to track dark energy's inf luence over the past 11 billion years. Researchers see hints that dark energy, widely thought to be a "cosmological constant," might be evolving over time in unexpected ways. ...read more read less