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

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

Amazing answers to your curious questions

Q What are some of the longest lifespans in fish? A Technically the longest lifespan lies with the Greenland shark, which live a staggering 250-plus years – perhaps even more than 500, in some cases.

Projecting our consciousness into other bodies and walking on alien worlds might not be such a far-flung concept

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