A Russian Soyuz crew ferry ship docked to the International Space Station spewed particles of an unknown substance, presumably coolant fluid, into space Wednesday night, forcing two Russian cosmonauts to call off a planned spacewalk as engineers on the ground scrambled to determine the source and the effects of the leak.
Three Russian cosmonauts rode a Soyuz spacecraft back to Earth Thursday after departing the International Space Station to wrap up 195 days. The Soyuz MS-21 spacecraft carrying cosmonauts Oleg Artemyev, Denis Matveev, and Sergey Korsakov undocked from the station at 3:34 a.m. EDT (0734 GMT) and landed at 6:57 a.m. EDT (1057 GMT).
Russian cosmonauts Sergey Prokopyev and Dmitry Petelin were joined by NASA astronaut Frank Rubio for launch Wednesday to begin a six-month expedition on the International Space Station. The crew lifted off from the Baikonur Cosmodrome in Kazakhstan at 9:54 a.m. EDT (1354 GMT) aboard a Soyuz rocket, and docked with the space station at 1:06 p.m. EDT (1706 GMT).