AI‑Powered Survey Uncovers 70 New Cosmic Magnifying Glasses

An international consortium of astronomers has announced the discovery of 70 previously unknown gravitational lenses, a finding made possible by the world’s most extensive two‑dimensional map of the cosmos. The lenses—massive galaxies or clusters that bend and amplify light from more distant objects—offer natural telescopes for probing the distant universe.

The breakthrough stems from the Dark Energy Spectroscopic Instrument (DESI) Legacy Imaging Surveys, which have compiled detailed imaging of roughly one‑third of the sky. Researchers fed this massive dataset into sophisticated artificial‑intelligence algorithms designed to flag the subtle arcs and rings that betray a lensing event.

“The combination of deep, uniform imaging and machine‑learning filters allowed us to sift through millions of galaxies in a fraction of the time traditional methods would require,” said a member of the collaboration. The AI system highlighted candidates that were then vetted by experts, confirming 70 new lens systems that span a range of redshifts and mass scales.

Gravitational lenses are prized tools in astrophysics because they magnify faint, distant galaxies, enabling studies of early star formation, dark matter distribution, and the expansion rate of the universe. Each newly identified lens adds to a growing catalog that can be targeted for follow‑up observations with space‑based telescopes such as the James Webb Space Telescope and ground‑based facilities equipped with adaptive optics.

The discovery also expands one of the largest publicly available lens compilations, which previously listed just over a hundred systems. By increasing the sample size by roughly 60 percent, the new lenses improve statistical analyses that test cosmological models and refine measurements of the Hubble constant.

Looking ahead, the team plans to apply the same AI pipeline to upcoming surveys, including those from the Vera C. Rubin Observatory. With deeper, wider imaging on the horizon, astronomers anticipate that the catalog of gravitational lenses will continue to grow, sharpening our view of the universe’s most distant and enigmatic epochs.