Beyond Pluto: the hunt for our solar system's new ninth planet

Is there a planet larger than Earth lurking in the far reaches of our solar system? After decades of debates on the subject, a new powerful telescope might be able to settle the matter finally. Astronomy journalist and author Stuart Clark, reports on what findings the machine named after the renowned astronomer Vera C. Rubin would be able to find when it begins surveying the skies in 2022.