New data involving millions of galaxies and luminous galactic cores is providing fresh evidence that the enigmatic and invisible cosmic force called dark energy - responsible for the universe's accelerated expansion - has weakened over time rather than remaining constant,

Astronomers thought dark energy was a constant. But now, findings from the Dark Energy Spectroscopic Instrument provide even more evidence that it may be fluctuating

The Dark Energy Spectroscopic Instrument, or DESI, is an international effort involving more than 900 researchers. The project has produced gargantuan sky maps and helped reveal some of the universe’s largest structures,