Brian Cox and Dara O Briain return for their third night celebrating space and astronomy, with more updates from British astronaut Tim Peake. This time they explore what keeps Tim and his International Space Station crew-mates safe in the hazardous environment of space. Brian and Dara also welcome a very special guest to take the gravity challenge - and find out what it would feel like to walk on Mars and the Moon.Roving reporter Liz Bonnin once more reports live from the European Astronaut Centre in Cologne, where she tests whether comedian John Bishop has the 'right stuff'. A lifelong astronomy fan, John will be strapped into a giant centrifuge machine to experience how future astronauts will simulate gravity during missions into deep space.Brian and Dara are joined in the studio by Dame Jocelyn Bell-Burnell, to hear how she discovered the first pulsar star - giving astronomers all over the world one of their most precious tools for studying the universe. They also find out whether Stargazing viewers have discovered any new pulsars in their three-night search, training Jodrell's famous telescope onto them to reveal exactly what has been discovered, and how much that means to astronomers.

As British astronaut Tim Peake exits the safety of the International Space Station for his very first spacewalk, Brian Cox and Dara O Briain watch him every step of the way in this Stargazing Special. They are joined by someone with a unique insider's view and who has done this himself, astronaut and former Space Station commander Chris Hadfield. Find out about the perils that Tim is facing and what is really going on as he carries out time-critical emergency repairs in the dangerous vacuum of space.

Stargazing Live is back for its seventh year - this time promising to blow your mind with a totally new view of the night sky - live, from the bottom of the world!Professor Brian Cox and Dara O Briain have packed their sunscreen and headed to Australia to gaze up at a sky that will be completely unfamiliar to viewers in the UK - packed full of the most astonishing features from constellations like the Southern Cross, famously featured on Australia's flag, to jewel-like clusters of stars and perfectly positioned planets. But capping it all is the most remarkable view of the Milky Way, arching overhead like a river of stars. Join them live as they finish a long night under the stars, and as dawn approaches in Australia.Brian and Dara are joined by Liz Bonnin and Aussie outback-astronomer Greg Quicke as their guide to the southern sky. Surrounded by kangaroos, snakes and spiders, the team reveal the wonderful star-tales told by indigenous people, embark on a mission to catch a shooting star and celebrate Australia's role in rescuing the stricken Apollo 13 moon mission. Plus, we ask viewers' help in a challenge to find the missing ninth planet in the solar system.