Early Discoveries from Euclid: Results from the First Public Data Release

Launched in July 2023, the Euclid space mission aims to map the geometry and growth of cosmic structures with unprecedented precision using weak-lensing measurements and galaxy clustering, including baryon acoustic oscillations (BAO). With high-resolution optical and near-infrared imaging and slitless spectroscopy, Euclid will observe millions of galaxies across more than one third of the sky, enabling powerful tests of dark matter, dark energy, and gravity, while also providing a valuable legacy dataset for galaxy and transient astrophysics.

In this talk, I will briefly introduce Euclid’s survey strategy, instruments, and main observables, and then present results from the first public dataset, Quick Data Release 1 (Q1), released in March 2025. I will highlight early “non-cosmology” science from Q1, including strong-lensing discoveries, rare and active galaxies, ultra-bright galaxies beyond z~8, and new samples of nearby dwarf galaxies. I will conclude with a short overview of how to access the Q1 data and an outlook toward the much larger DR1 release expected in late 2026.