...Oumuamua took the world by storm in October 2017 when it was identified as the first known visitor from another star system. A pair of Harvard scientists suggested the long and thin object was a spacecraft, sparking a frantic flurry of scans by astronomers as it flew by.... ...Perhaps strangest of all was that the object appeared to accelerate on its journey, suggesting it was powered by something.... The new study lines up with research published last year....