Brian Cox and Dara O Briain return for their second night celebrating space and astronomy, with more updates from British astronaut Tim Peake as he tackles his six-month scientific mission, 250 miles above the Earth. Brian and Dara also explore the amazing engineering behind the International Space Station, demonstrating the catastrophic impact that ordinary atmospheric pressure can have on a space ship. Roving reporter Liz Bonnin reports live from the European Astronaut Centre in Cologne, where she is testing whether comedian John Bishop has the 'right stuff'. A lifelong astronomy fan, John will be following astronaut Tim Peake's training programme over three nights - tonight, what happens if there is an emergency on the Space Station. Brian and Dara are joined in the studio by European Space Agency director general Jan Woerner to explore Europe's ambitions for colonising the Moon, and they reveal which parts of the UK most resemble other planets in the Solar System. They have updates from the Hubble Space Telescope on its 25th anniversary, and also from the Rosetta mission, which landed on a distant comet in 2014. Meanwhile, Professor Lucie Green is on hand to guide you around the night sky.