'The dream has come true': Standard model of cosmology holds up in massive 6-year study of the universe — with one big caveat

A six-year survey of 669 million galaxies has provided the most comprehensive look yet at dark energy, the mysterious force driving the universe's accelerating expansion. The Dark Energy Survey confirms that the standard model of cosmology remains valid, showing that dark energy's density appears constant over time, though an alternative model where density varies also fits the data equally well. Researchers found that galaxy clustering patterns don't perfectly match theoretical predictions, suggesting gaps remain in our understanding of how the universe works.