The Manhattan-sized interstellar object 3I/ATLAS zipping through the solar system is producing a metal alloy never before witnessed in nature, an expert told The Post.

New images of the mysterious object taken by the Keck II telescope in Hawaii in August and released Wednesday, confirmed the interstellar flier is emitting a plume which contains four grams of nickel per second with no evidence of iron — unheard of in comets.

The end result is an alloy called nickel tetracarbonyl, which has only ever been previously witnessed in human manufacturing, Harvard astrophysicist Dr. Avi Loeb told The Post. 3

“There is only one place where that is known to exist and that is in industrially produced nickel alloys,” Loeb said. “This was never observed for any other object.”

In every known c

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