Commander Chris Hadfield joined Dan to talk all about his trips into space and his brand new kids book The Darkest Dark! Dan put some of your questions about space to him and just had to ask him about that super famous music video he filmed while on the International Space Station!

Plus, Marina Ventura is finding out all about weather,  we find out about awesome scanners that can read ancient Egyptian codes, and we discover the answer to why we sometimes get the feeling of butterflies in our tummies!how many stars are in the galaxy?