"Biver said the #comet was believed to have come from the #OortCloud, a theorized vast sphere surrounding the Solar System that is home to mysterious icy objects.

The last time the comet passed Earth was during the #UpperPaleolithic period, when #Neanderthals still roamed Earth."

https://www.sciencealert.com/a-comet-not-seen-in-50000-years-is-streaking-by-earth-soon-heres-when-to-look-up