First Visiter From Beyond

It is smaller than a quarter of a mile (400 meters) in diameter, but A/2017 U1 is perhaps the first known object from outside the solar system that has made its way inside. Some more data-crunching and analysis is still needed to confirm the interstellar nature of the object, which could be a comet or an asteroid.

A small asteroid or comet has become the first 'visitor' from beyond our solar system