UNITED NEWS INTERNATIONAL — Scientists are looking for clues from the past to explain a modern mystery.

They’re investigating a mysterious planet that might exist at the edge of our solar system.

It’s called Planet Nine.

Many astronomers think Planet Nine resides in an orbital path 20 times farther from the sun than Neptune.

But Planet Nine is not Pluto.

Pluto is a “dwarf planet” while Planet Nine is thought to have 10 times the mass of Earth.

No one has managed to glimpse Planet Nine yet but scientists say its presence would explain gravitational pull on some objects in the Kuiper Belt which is a disc of icy debris and comets beyond Neptune.

So two researchers from Queen’s University Belfast in Northern Ireland recently started studying medieval tapestries and scrolls for recorded sightings of comets in the Middle Ages. 

Computer models will hopefully reveal whether any of these comet sightings require the existence of Planet Nine.