Astronomers have discovered a far-out world circling the Sun.

How far out? It is so far out that the discoverers nicknamed it Farout. All they can see is a pinkish dot of light in the night sky, but that is enough to infer that they are looking at a 480km ice ball orbiting more than 18 billion km from the Sun - more than three times as far out as Pluto, and the farthest object ever observed in the solar system.