The data release covers roughly 14 percent of the total sky area that the space telescope will eventually map.
While telescopes like Hubble have delivered exceptional resolution, they cover significantly smaller patches of the sky. Taylor explained the technical advancement behind the mission in Around Prague:
The technological leap that’s Euclid is that we can keep that high resolution, but now we can basically map huge volumes of the sky, huge volumes of the universe.
Andy Taylor, University of Edinburgh
The Euclid mission aims to create the largest 3D map of the universe ever made, covering a third of the sky and spanning more than 10 billion years of cosmic history. This effort is designed to investigate two fundamental mysteries: dark energy and dark matter. According to reporting by The Guardian, these substances are thought to account for approximately 70 percent and 25 percent of the universe, respectively.
Prof. Andy Taylor said that while other sky surveys may be larger in scale, none possess the same level of information content or detail as Euclid.
Among the data are approximately 15,000 probable instances of strong gravitational lensing. This magnification effect occurs when a foreground galaxy—frequently anchored inside a larger cluster—bends the light of a distant background object into bright arcs or rings.
Dark matter substantially boosts this distortion by increasing the mass and gravitational pull of the foreground object. Researchers study these patterns to test theories about the nature of dark matter.
“With strong gravitational lensing, you find out how the dark matter is clumping and that’s very diagnostic of the type of matter that it is, because different types of matter can clump in very different ways,” said Stephen Serjeant, a professor of astronomy at the Open University.
“So if you're looking for where the next breakthrough will be in the properties of dark matter and what dark matter actually is, there's a good chance – I can't say it's certain – but there's a good chance it might come from strong gravitational lensing,” Stephen Serjeant, a professor of astronomy at the Open University, said.
Astronomers previously knew of roughly 1,000 strong lensing cases. The current dataset raises that count to about 15,000 candidates, with researchers anticipating roughly 170,000 detections by the conclusion of the mission. These findings currently represent candidates rather than confirmed cases.
The sheer scale of the output means automated tools must process the observations, as human review of every individual data point is no longer feasible.
“No human eyeball is able to look at all of the Euclid data any more. It’s now too big,” Taylor said.
A subsequent data drop is scheduled for next summer. That release will incorporate findings on galaxy distribution and weak gravitational lensing, which involves subtle distortions of distant light caused by foreground dark matter.
“We can use that pattern of distortions to actually make a map of where all the dark matter is in the universe,” Taylor said, adding that scientists could use these maps to determine statistical properties and compare them against various theories.