United States (US) astronaut Peggy Whitson is a on a record breaking mission. Whitson, who has been on the International Space Station (ISS) since November 2016, will stay in orbit until September 2017. By the time she lands back on Earth, she would have spent more time in space than any other US astronaut and the most by a woman astronaut. Whitson is also the first woman to command (be in charge of) the ISS.
The ISS is a space craft that orbits (goes around) the Earth in space. It belongs to several countries, including the US.
Whitson’s long stay on board the ISS will help scientists study the effect that long term space travel has on the human body. This is important as humans will no doubt travel further and further away from earth as we explore our universe.