Euclid was built to map distant galaxies, but moving-object software found a comet streak in its survey images. ESA announced C/2026 S1 (Euclid), its first previously unknown comet, on October 19, 2026. The discovery used images from September 16–24; catalogue checks and follow-up observations led to Minor Planet Center confirmation on October 8. A galaxy survey had revealed a new Solar System object.
Sources:
https://www.esa.int/Science_Exploration/Space_Science/Euclid/Euclid_discovers_new_comet
https://youtube.com/shorts/MYfItnqHFIE
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