NASA spotted unexpected boost in speed and shift in trajectory as it passed through the inner solar system last year
Now one study claims it could actually be a solar sail sent by aliens
Alternatively, a more exotic scenario is that ‘Oumuamua may be a fully operational probe sent intentionally to Earth vicinity by an alien civilization,' they added.
Astronomers from the Harvard Smithsonian Center for Astrophysics (CfA) analyzed the strange cigar shape of the object, and an unexpected boost in speed and shift in trajectory as it passed through the inner solar system last year.
The researchers say the strange acceleration could the the result of solar radiation pushing a giant solar sail.
They found a sail that was only a fraction of a millimeter thick (0.3-0.9 mm) would be sufficient for a sheet of solid material to survive the journey through the entire galaxy.
Another option, which explains the lack of communication, a lack of any kind of signal could mean the giant object is actually an 'alien shipwreck'.