"After studying the available evidence, Avi Loeb concluded that the simplest explanation for the exotic strangeness of ‘Oumuamua was that the interstellar object had been created by an intelligent civilisation beyond Earth"

What did aliens mean by this?

src:https://www.economist.com/books-and-arts/2021/02/13/a-distinguished-astronomer-sees-evidence-of-extraterrestrial-life?utm_campaign=editorial-social&utm_medium=social-organic&utm_source=twitter