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New Evidence Suggests Dark Energy May Be Weakening

12/18/2025

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Summary

Story summary

In December 2025, physicists reported significant findings about dark energy.
A new map from the Dark Energy Spectroscopic Instrument (DESI) suggests dark energy may be weakening over time.
An April 2024 map suggested similar conclusions, and the Dark Energy Survey also supported the claim.
Although not yet conclusive, the Vera C. Rubin Observatory in Chile will map 20 billion galaxies over the next decade to clarify dark energy’s properties.

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Story summary

In December 2025, physicists reported significant findings about dark energy.
A new map from the Dark Energy Spectroscopic Instrument (DESI) suggests dark energy may be weakening over time.
An April 2024 map suggested similar conclusions, and the Dark Energy Survey also supported the claim.
Although not yet conclusive, the Vera C. Rubin Observatory in Chile will map 20 billion galaxies over the next decade to clarify dark energy’s properties.