Scientists Need Your Help to Find Galaxies Bending Light in Space

The European Space Agency’s Euclid spacecraft has released a vast new dataset from its mission to map the dark universe, and researchers are inviting the public to assist in identifying gravitational lenses—phenomena where massive galaxies bend and distort light from even more distant objects behind them. This citizen science initiative, hosted on the Zooniverse platform as part of the Space Warps project, allows anyone with an internet connection to contribute to cutting-edge cosmology research.

Gravitational lensing occurs when the gravitational field of a massive object, such as a galaxy or galaxy cluster, warps the fabric of spacetime, causing light from background objects to follow curved paths. When alignment is precise, this can produce striking visual effects like arcs, multiple images, or complete rings known as Einstein rings. These phenomena are not optical illusions but direct consequences of Einstein’s general theory of relativity and serve as powerful tools for studying invisible dark matter and the large-scale structure of the cosmos.

According to the European Space Agency, Euclid launched in July 2023 and began its survey observations in February 2024. During its first week of operations, the spacecraft observed approximately 26 million galaxies, with the most distant located about 10.5 billion light-years away. The initial data release amounted to roughly 35 terabytes—equivalent to 200 days of high-definition video streaming—and included deep-field imagery, surveys of nearly 380,000 galaxies, and hundreds of gravitational lens candidates.

Carole Mundell, ESA’s Director of Science, emphasized that Euclid’s dual role as both a “dark universe detective” and a “time machine” enables scientists to look back across 10 billion years of cosmic history. By mapping the distribution and evolution of galaxies over time, the mission aims to uncover the nature of dark matter and dark energy, which together constitute about 95% of the universe’s total mass-energy content.

The Space Warps project leverages human pattern recognition to identify subtle lensing features that automated algorithms might overlook. Volunteers examine image cutouts from Euclid’s survey, looking for signs of distorted arcs, rings, or multiple images indicative of gravitational lensing. Each classification is reviewed by multiple users, and consensus results are forwarded to professional astronomers for follow-up analysis.

This approach builds on the success of earlier gravitational lens hunts using data from ground-based telescopes and the Hubble Space Telescope. However, Euclid’s wide-field, high-resolution imaging capabilities—designed specifically for dark energy and dark matter research—offer an unprecedented opportunity to discover thousands of new lenses across a significant portion of the extragalactic sky.

As of the latest update, Euclid has completed only about 0.4% of its planned survey. The mission is scheduled to continue until 2030, with the goal of creating the most detailed 3D map of the universe ever produced. Public participation through initiatives like Space Warps not only accelerates scientific discovery but also fosters broader engagement with astrophysics and the scientific process.

Those interested in joining the search can visit the Space Warps project on Zooniverse, where a brief tutorial guides users through what to look for in the image data. No prior expertise is required—only attention to detail and curiosity about the universe.

By combining cutting-edge space technology with collective human effort, the Euclid mission exemplifies how modern science can advance through collaboration between professionals and the public. Each discovered lens brings researchers closer to understanding the invisible forces shaping the cosmos.