3I/ATLAS (C/2025 N1): The Third Confirmed Interstellar Visitor and Its Complex Chemistry

To the point

3I/ATLAS is a rare interstellar visitor spotted in 2025, probably native to the Milky Way rather than alien technology, with a very active gas cloud rich in carbon dioxide and other volatiles and a solid core roughly 300 meters to over a kilometer across, unusually heavy-element rich (nickel present but iron not detected), with debated origins, and scientists including Avi Loeb plan further observations to refine its orbit and composition, while no spacecraft rendezvous is planned.

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3I/ATLAS Update: Harvard Expert Claims Alien Spaceship Is From Milky Way Disc
ibtimes.co.uk

3I/ATLAS Update: Harvard Expert Claims Alien Spaceship Is From Milky Way Disc

Harvard astrophysicist Avi Loeb says interstellar comet 3I/ATLAS likely comes from the Milky Ways disc, as astronomers grapple with its bizarre chemistry and disputed age.