According to latest report published in Journal Nature Astronomy suggest 'Oumuamua is encased in a dry, carbon-rich crust that could have protected a water-ice core from being vaporized as it made a close pass of our sun earlier this year. You can almost think of it as the hull of a spaceship.One of the strangest things about interstellar visitor Oumuamua is that when it flew right by the sun, it didn't get a comet-like tail.Scientists now believe that's because it's coated in a half-metre thick shield.Oumuamua's strange cigar-like shape, its odd trajectory and lack of tail raised suspicions it could be artificial in origin.