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

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

Amazing answers to your curious questions

Earth’s orbit around the Sun is slightly elliptical, which means our distance from the Sun varies over the course of the year – and that brings effects that are fascinating to capture. The variation s

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