News Cosmology

A map of 14 million galaxies and quasars deepens a dark energy mystery

New data from the DESI survey reaffirm a previous hint that dark energy may vary over time

Stars swirl across the sky, creating a circular pattern in this time-lapse photo. In the foreground on a small rise of land is the Mayall Telescope at Kitt Peak National Observatory in Arizona, which is conducting the DESI dark energy survey.

Stars swirl across the sky in this time-lapse photo of the Mayall Telescope at Kitt Peak National Observatory in Arizona, which is conducting the DESI survey.

B. Tafreshi/KPNO/NOIRLab/NSF/AURA

By Emily Conover

Updated

ANAHEIM, Calif. — Change is in the air. New data strengthen a hint that dark energy, long thought to be a constant force in the universe, might change over time.

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