Wait a second, was that weird interstellar object an alien spacecraft after all?

One of the most bizarre pieces of space news that keeps popping up this year is the story of Oumuamua, a cigar-shaped object that sped through our Solar System so fast that scientists barely had time to glimpse it before it was already headed back out into space. It's the first interstellar object mankind has ever seen, and it's sparked a ton of debate over its origins and what exactly it was. Early on, the object was thought to be a comet, but observers later decided it was obviously an asteroi...