NASA's Astronaut Candidate Jack Hathaway joins us in this week's Science Weekly podcast to chat all about his journey to become an astronaut and we also hear how you can go to space with Mission Transmission! We catch up with Sidney McSprocket who is teaching us about Great British Scientists - this week its about William Jenkins and Lucy Hughes. Whilst there is a deadly comet that gets closer each time it visits us in Dangerous Dan. In Kareena's Chemistry, Kareena takes a dive into new and innovative ‘Green Chemistry’ which is helping to tackle the challenge of climate change in innovative new ways. Plus in Science in the News, Dan talks about new dinosaur footprints found in the UK!