A Saturday night out, 260 miles above London

Watch live as ESA astronaut Tim Peake becomes the first British citizen to walk in space. He will step outside the International Space Station with fellow astronaut Tim Kopra to perform crucial repairs on the orbiting outpost’s electrical system.

Dark matter, the mysterious substance that constitutes most of the material universe, remains as elusive as ever. Although experiments on the ground and in space have yet to find a trace of dark matter, six or more years of data from NASA’s Fermi Gamma-ray Space Telescope has broadened the mission’s dark matter hunt using some novel approaches.

British astronaut Tim Peake, along with Soyuz commander Yuri Malenchenko and outgoing space station skipper Tim Kopra, departed the International Space Station today aboard the Soyuz TMA-19M capsule and landed safely in Kazakhstan at 1016 BST (0916 GMT).