The Dark Energy Spectroscopic Instrument (DESI) has released its first major data set, cataloging over 18 million cosmic objects, including stars, galaxies, and quasars. Among the most intriguing findings is evidence suggesting that dark energy—the mysterious force accelerating the universe’s expansion—may be evolving over time. While the signal does not yet reach the 5-sigma threshold required for definitive confirmation, it ranges between 2.8 and 4.2 sigma, indicating a significant deviation from the standard cosmological model. If these findings are confirmed, they could mark the first major change in our understanding of the universe in decades. The implications of a time-varying dark energy could lead to a profound shift in cosmological theories and our understanding of the universe’s fate.