Oumuamua: Harvard Researchers Explore Possible Signs of Life and the Alien Solar-Sail Hypothesis
To the point
Avi Loeb and Shmuel Bialy contend that the interstellar visitor Oumuamua could be an alien-made, lightweight solar sail pushed by radiation pressure, possibly debris from a defunct craft or a reconnaissance probe, and they urge an open, collaborative search as more such objects are detected.
