That strange object that flew through out solar system which scientists named Oumuamua might not be a spacecraft - at least not as we know it - but scientists are finding more than enough to study.

"We have discovered that the surface of Oumuamua is similar to small solar system bodies that are covered in carbon-rich ices, whose structure is modified by exposure to cosmic rays," said Queen's University Belfast Professor Alan Fitzsimmons.  "We have also found that a half-meter thick coating of organic-rich material could have protected a water-ice-rich comet-like interior from vaporizing when the object was heated by the sun, even though it was heated to over 300 degrees centigrade."

Oumuamua/Artist Depiction

So, it's "kind of" like a comet, but has an "organic" coating.

Oumuamua caught astronomers' attention when it blasted through the solar system in October, arcing around the sun at such a wide angle that scientists ruled out a comet immediately.  It also lacked the plume of dust and ice that is usually observed from Earth as a comet's tail.  However, the needle-like shape of the object that really sparked their curiosity.  Many scientists believed that such a shape would be ideal for a starship since it would present the slimmest profile and thus avoid contact with stellar dust and gaseous particles while zooming around the cosmos.