There are excited rumblings in the astronomy world after suggestions our solar system contains a never-before-seen planet.

Researchers say they have evidence that a planet about ten times the mass of Earth has been hiding in the outer solar system.

The object has been tentatively nicknamed Planet Nine, and is the subject of a new a study that aims to start the search for our long lost neighbour.

Have a look at our latest feature article for the story of its discovery, and the new quest to add to the Sun's family portrait.

FEATURE ARTICLE: Experts Orbit Notion of Ninth Planet