Euclid releases a data foundation containing over 900 million galaxies

ESA released Euclid's DR1-Foundation on November 12, the mission's first major data batch since launch in 2023. Thirteen months of observations cover 1,900 square degrees, equal to 9,500 full Moons, and capture more than one billion objects: over 900 million galaxies, about 15,000 strong-lensing candidates, more than 60 million quasar candidates and spectra from over 160 million sources. The release covers only about 14% of the planned survey area, with full DR1 due in mid-2027. Its achievement is an explorable base for 3D maps of dark matter, dark energy and the cosmic web, not a final answer to those mysteries.