The first mysterious object to reach our solar system was originally thought to be a comet or an asteroid from within the system.
But, scientists realised it was neither and had travelled unimaginable disatances through interstellar space at almost 200,000 mph.
Now, a scientific body led by Stephen Hawking is now trying to decipher whether the “cigar-shaped” object is an alien probe or a previously unseen natural phenomenon.
Professor of astrophysics at Harvard University Avi Loeb said: “Perhaps the aliens have a mothership that travels fast and releases baby spacecrafts that freely fall into planetary system on a reconnaissance mission.
Read More: Express.co.uk