Major Tim Peake is our guest this week! Tim is a British astronaut who spent six months on board the International Space Station last year - and is only the seventh person from the UK to ever go to space! Tim chats to Dan about the incredible things he got up to, the worst space food he had to eat and the surprising things he saw whilst brushing his teeth! Plus, he explains how you can become an astronaut.
It's a space special - we also take a look at the Moon, discover why we're hoping to go to Mars next and why there's so much junk floating around in space!