A new data release from the Dark Energy Spectroscopic Instrument hints that the universe's dark energy is not constant and may be weakening over time.
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New data hints dark energy in the universe is evolving On March 19, 2025, scientists published the results of a new analysis using the Dark Energy Spectroscopic Instrument (DESI), mounted on the Nicholas U. Mayall 4-meter Telescope at Kitt Peak National Observatory in Arizona. With the first three years of data involving some 15 million galaxies and quasars, they've found hints that dark energy changes over time. Dark energy, which makes up some 70% of the universe, is a mysterious force that drives the accelerating expansion of our universe. DESI helped create the largest yet 3D map of our universe. With this map, scientists could see how dark energy has influenced our universe over the past 11 billion years. And indeed, what they found was that this influence has not been a cosmological constant, but it has changed over time. The DESI collaboration published their peer-reviewed findings on March 19, 2025, in multiple papers that you can read on the DESI collaboration website. In addition, the scientists also presented their findings at the American Physical Society's Global Physics Summit in Anaheim, California. 2025 EarthSky lunar calendar is available now. A unique and beautiful poster-sized calendar with phases of the moon for every night of the year. Get yours today! Dark energy may be weakening over time The findings draw upon the data from…