A mysterious object spotted floating through our solar system last year might be an alien spacecraft that was investigating Earth, according to Harvard astronomers.
The astronomers suggested the theory in a recent research paper.
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Researchers based their theory on the speed that the object traveled, which was around 196,000 mph, which they say indicates it may have an "artificial origin."
"Oumuamua may be a fully operational probe sent intentionally to Earth vicinity by an alien civilization," they wrote in the paper, which has been submitted to the Astrophysical Journal Letters.
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The object, called Oumuamua, was first found by telescope in Hawaii in 2017.
Oumuamua is the first object seen in our solar system that is known to have originated elsewhere.