Soyuz

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.

Russian engineers are evaluating an apparent coolant leak coming from the Soyuz MS-22 crew ferry ship docked to the International Space Station. The leak was discovered around 7:45 p.m. EST Wednesday (0045 GMT Thursday) and forced the cancellation of a planned spacewalk by two Russian cosmonauts.

Russia launched a Progress supply freighter Tuesday on a two-day trek to the International Space Station to deliver 5,556 pounds of cargo, fuel, water, and nitrogen to the orbiting research laboratory. A Soyuz booster launched the Progress cargo ship from the Baikonur Cosmodrome in Kazakhstan.

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).

Despite severely strained U.S.-Russian foreign relations, an American astronaut joined two Russian cosmonauts aboard a Soyuz spacecraft in Kazakhstan and rocketed into orbit Wednesday on a two-orbit flight to the International Space Station.