Space, Stars, and Slimy Aliens

What happens to our bodies in space? Can we live on other planets? Who invented the telescope and how can we make one at home? Mark receives a letter from the head of the channel saying that he is going to be sacked if anything else goes wrong on the show! Lucy, Bob and Professor McTaggart try and make sure they for once everything goes smoothly. Everything seems to be going well until legendary astrologer Galileo arrives and is keen to start selling his telescopes...Lucy is outraged and decides to teach him a lesson!