3I/ATLAS: The Third Interstellar Comet Tracked by Global Observatories and the First X-ray Detection

To the point

3I/ATLAS is the third known interstellar object and the first interstellar comet, discovered by the ATLAS survey in July 2025, that passed through the inner solar system and was observed by many missions, including being detected in X-ray light.

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Comet 3I/ATLAS – frequently asked questions

Note that this list is regularly updated as we learn more about interstellar Comet 3I/ATLASFor an overview of all ESA observations of 3I/ATLAS, please visit esa.int/3IATLAS