The UK's first official astronaut, Major Tim Peake, is chatting to Newsround today and we'd like your questions for him.
Tim Peake is going to spend six months on board the International Space Station carrying out scientific experiments next year.
Do you want to ask him about space or why he wanted to become an astronaut? Perhaps you want to know about the training he's doing to get ready for his mission?
Whatever you'd like to ask, let us know. We'll put some of the best questions to Tim.