Astronomers are now regularly detecting planets thousands of light years from Earth – but have we missed one in our own Solar System?

How many planets are there in the Solar System? It sounds like an easy question, but it’s more complex than you might think – and actually it’s one we still can’t answer. With scientists finding evide

Enceladus is a medium-sized moon of Saturn made up of a crust of water-ice and an ocean of liquid water below. This ocean is in some senses similar to those on Earth and is connected directly to Encel

As an astronomer, I collect stars. There are several hundred billion of them in our Galaxy, the Milky Way, so it’s important to find a way to categorise them. While others might rank their stars by co

An artist’s impression of Cha 1107-7626 accreting material ...

Although it’s by no means certain, scientists are slowly accumulating evidence that life once existed on the Red Planet