A year in space: Soyuz docks at the International Space Station
A Russian Soyuz spacecraft has docked at the International Space Station (ISS) carrying three astronauts, two of whom are due to spend a record 12 months there.
Doctors will observe the effects of weightlessness on the pair beyond the usual six-month deployment.
Nasa wants to collect the data for a possible future manned trip to Mars.
Catharina Moh reports.