The crew of the shuttle Discovery has safely docked at the International Space Station, to a warm welcome from the astronauts already on board. For five of the seven person team, this is their first space venture – and it is a vital one. The work they will carry out in the coming week is essential to all remaining missions. Under the watchful eye of mission control, they will hook up a new power system – a set of solar arrays delivered in September – so that extra laboratory modules can be added to the complex next year. The shuttle also transported a new piece of the station’s external structural backbone. It is scheduled to be installed during the first spacewalk of the mission, due to take place today.