Was Oumuamua An Alien Spacecraft?

On November 1st 2018, two Harvard astronomers posted a paper that endeavors to make the case that the asteroid Oumuamua was actually an alien spacecraft. Oumuamua is a cigar shaped object that was spotted passing through our solar system by the Pan-STARRS 1 telescope in Hawaii in 2017. In their paper, the two scientist mark as fact, that Oumamua was 400 meters long, but only a tenth as wide.

The object also flew by on a trajectory that places its origin somewhere outside our solar system, and it appeared to accelerate as it made its way through. The two researchers, Shmuel Bialy and Avi Leob believe that Oumuamua's acceleration is the most notable clue. While some have considered Oumuamua to be a comet, they point out that comets tend to develop a tail as they round the sun, but Oumuamua did not have one.

If this doesn't make the case for aliens, Bialy and Leob postulate that because of Oumuamua shape size and dimensions, it's possible that it could be a piece of advanced technology called a solar sail. A solar sail uses the power of whats known as the solar wind as a means of propelling a spacecraft. They suggest that Oumuamua may be a piece of debris that may have broken off from some alien craft. The two also posit that Oumuamua could have been a probe designed to gather information about possible life in our solar system.