The object's flat, elongated shape and reddish colour is from outside our solar system, according to the researchers.
The work, written by Professor and chair of the Department of astronomy Abram Loeb, and the owner of scientific degrees Shmuel Balam, Harvard Smithsonian center for astrophysics, notes that similar light sails already exist on earth.
Whether Oumuamua is a light sail from a spacecraft of artificial origin floating aimlessly through solar systems or an operational probe sent intentionally to Earth, the researchers said its likely origin will only be determined by searching for other objects like it in the future.
Other studies have suggested that other "Oumuamua-like objects" will potentially enter our solar system, with some potentially carrying life. In fact, some scientists seem to think that the simplest explanation for the object is probably the most plausible. Astronomers were sure that the object was not a member of our solar system and came from some distant world in the universe.
But Alan Jackson, a fellow at the Centre for Planetary Sciences at the University of Toronto Scarborough, told CNN the study was "distinctly lacking in evidence, never mind extraordinary evidence" and that the spectral data suggested the object was an asteroid or comet.
"It is impossible to guess the goal behind Oumuamua without more data", Loeb was quoted as saying.
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The study, which was posted online earlier this month, suggests that Oumuamua's odd "excess acceleration" could be artificial in nature, as it has been implied that it is not an active comet.
"And here's a story fromNBC News saying an alien spacecraft may be above Earth and no one's noticing it", Stu laughed. In order for it to be effective, Oumuamua needs to be less than a millimeter in thickness, like a sail.
"The thing you have to understand is: scientists are perfectly happy to publish an outlandish idea if it has even the tiniest *sliver* of a chance of not being wrong", Katherine Mack, an astrophysicist, wrote on Twitter.
"Two very capable, very bright astronomers, from a very credible organization, Harvard, have come out with the notion that Oumuamua could be alien in origin", Diamond said.
Of course, the pair aren't claiming that Oumuamua's definitely of alien origin.
"But it's important to distinguish that the researchers who wrote the new paper have expertise in solar sails, so they're suggesting that "Oumuamua could be like a solar sail, said Coryn Bailer-Jones of the Max Planck Institute for Astronomy".