For thousands of years human civilization has documented objects in the sky. With the advent of instant video sharing, we've seen hundreds, perhaps thousands of cases of unidentified flying objects. Scientists and governments have discounted the vast majority of these instances as meteors, asteroids, man-made rocket tests or weather balloons.

But on October 19, 2017, a Canadian astronomer saw an anomaly floating through our solar system that can't be so easily dismissed.

The object, dubbed "Oumuamua," is the first ever object detected by humans that originated outside of our own solar system. Moreover, what makes Oumuamua even more intriguing is that as it rounded the sun it accelerated in such a way that our known laws of physics simply can't explain it.

That is, unless the object has its own propulsion system, which would in turn suggest that it is not naturally occurring, but rather, deliberately built by an advanced civilization.