{"id":262460,"date":"2025-03-19T22:23:16","date_gmt":"2025-03-19T22:23:16","guid":{"rendered":"https:\/\/news.talkwithrattan.com\/index.php\/2025\/03\/19\/a-map-of-14-million-galaxies-and-quasars-deepens-a-dark-energy-mystery\/"},"modified":"2025-03-19T22:23:17","modified_gmt":"2025-03-19T22:23:17","slug":"a-map-of-14-million-galaxies-and-quasars-deepens-a-dark-energy-mystery","status":"publish","type":"post","link":"https:\/\/news.talkwithrattan.com\/index.php\/2025\/03\/19\/a-map-of-14-million-galaxies-and-quasars-deepens-a-dark-energy-mystery\/","title":{"rendered":"A map of 14 million galaxies and quasars deepens a dark energy mystery"},"content":{"rendered":"
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Change is in the air. New data strengthen a hint that dark energy, long thought to be constant force in the universe, might change over time.<\/p>

Dark energy explains the observation that the universe\u2019s expansion rate is accelerating. But its origins are unknown. It\u2019s typically expected to have constant density across the billions of years of the universe\u2019s history. So when researchers from the Dark Energy Spectroscopic Instrument, or DESI, reported in 2024 that dark energy might vary over time<\/a> based on their first year of data, it shook cosmology to its core.<\/p>\n\n\n\n

Many scientists expected that the standard picture would prevail with additional data from DESI. But that hasn\u2019t happened. Instead, with three years of DESI data, the preference for a changing, or dynamical dark energy has grown.<\/p>\n\n\n