Oumuamua is the strange, cigar-shaped space rock that hurtled through our interstellar neighborhood at high speed, then left as fast as it came. Scientists were baffled. What was it? What could have caused that rock to move in that fashion? Was it some wild explosion or event?
This fall, scientists have floated a new possibility: it's aliens! Really, there is at least the possibility that this rock was an object created by an alien race. But how would they know? Can they track it? And then, what are the ethics, if we ever do make contact? Our guests: