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How do we know 3I/ATLAS is an interstellar object?

So I just read this article

https://bohring.substack.com/p/the-story-of-interstellar-comet-3iatlas

Briefing about the newly discovered comet 3I/ATLAS. But this article (take a look once) doesn't explain how we know such objects are interstellar. Could anyone please explain this to me?

https://i.redd.it/ovzu1tsphlcf1.gif
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