The Progress MS-21 spacecraft will undock from the Poisk module of the International Space Station.
After undocking, the cosmonauts will rotate the ship remotely and take imagery of the leaked radiator.
It will then de-orbit and burn up in the atmosphere.
The International Space Station (ISS) is a space station, or a habitable artificial satellite, in low Earth orbit. Its first component was launched into orbit in 1998, with the first long-term residents arriving in November 2000. It has been inhabited continuously since that date. The last pressurised module was fitted in 2011, and an experimental inflatable space habitat was added …