The UFO – named “Oumuamua” – is the first object discovered in the solar system that appears to have come from another galaxy.
At the moment, there is “no consensus” on where Oumuamua has come from, but according to Professor Matt Genge scientists are already looking into the possibility of alien life on it.
Speaking to Sky News, the Imperial College London professor said the object is ten times longer than it is wide.
He said: “planetary scientists are really struggling to come up with an explanation of why that object is that shape.”
On the potential for extraterrestrial, Professor Genge added: “One of the explanations we have to explore, is it artificial, is it an alien craft?
“The Search for Extraterrestrial Intelligence is looking at it with a radio telescope. They’re going to be looking very carefully for any sign of signals coming from the object, they’re going to look at the shape a lot better – because it is a long way from us and moving very quickly – and they are also going to see if they can detect any trace gasses coming off of it.
“If it turns out this was some artificial device then we would expect some signals to be coming off of it.
“At least with our technology, there is one thing we do know – the way it reflects light.
“It reflects light very similar to certain astroids that are similar to organic material. We have an idea what it is made out of.”
Professor Genge added it was made of “organic materials with trace mineral content”.
A scientific body led by Stephen Hawking has also joined the race to decipher whether the object is an alien problem 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 spacecraft that freely fall into a planetary system on a reconnaissance mission.
“If this object is natural in origin, there should be much more like it in the solar system… and even if most of them are natural, perhaps one of them will be found to be of artificial origin, some space device or junk from an alien civilisation.
“The more I study this object, the more unusual it appears, making me wonder whether it might be an artificially made probe which was sent by an alien civilisation.”