Brian Cox and Dara O'Briain are back for the last night of Stargazing Live where they will be presenting further updates on British astronaut Tim Peake on the International Space Station - examining what keeps him and his crew-mates safe in space. Liz Bonnin reports live from the European Astronaut Centre in Cologne, where she straps John Bishop to a giant centrifuge machine to help him experience how future astronauts will simulate gravity during missions into space. Plus, Jocelyn Bell-Burnell is in the studio to discuss how she discovered the first pulsar star.