<ul><li>Dark energy, the mysterious force powering the expansion of the universe, appears to be weakening, according to a survey.</li><li>Results from the dark energy spectroscopic instrument (Desi) team at the Kitt Peak National Observatory suggest that dark energy reached a peak billions of years ago and is now about 10% weaker.</li><li>If confirmed, these findings could challenge the widely accepted theoretical model of the universe and potentially lead to a big crunch scenario, where the expansion of the universe goes into reverse.</li><li>The results, based on the most detailed three-dimensional map of the universe created by Desi, indicate that dark energy is declining rather than remaining constant.</li></ul>

Dark energy: mysterious cosmic force appears to be weakening, say scientists

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