A Russian space freighter that failed to deliver supplies to the International Space Station last week is due to re-enter Earth’s atmosphere as soon as Thursday.

Northrop Grumman’s Cygnus supply ship set for liftoff Saturday will deliver to the International Space Station the final hardware for a series of ambitious spacewalks later this month to install a new coolant system on the Alpha Magnetic Spectrometer, a $2 billion particle physics experiment seeking the cosmic signatures of dark matter and antimatter.

Russian commander Sergey Prokopyev, German flight engineer Alexander Gerst, and NASA astronaut Serena Auñón-Chancellor closed out a nearly 197-day space mission with a landing in Kazakhstan aboard their Soyuz MS-09 crew carry ship at 0502 GMT (12:02 a.m. EST) Thursday. The Soyuz crew undocked from the International Space Station at 0140 GMT (8:40 p.m. EST Wednesday) to begin their return to Earth.