- Summary- Companies- NASA asks SpaceX about its Crew Dragon backup capabilities- NASA, Russia's space agency probing cause of Soyuz leak- Three-man Soyuz crew's return ride from space station unclearWASHINGTON, Dec 28 (Reuters) - NASA is exploring whether SpaceX's Crew Dragon spacecraft can potentially offer an alternative ride home for some crew members of the International Space Station after a Russian capsule sprang a coolant leak while docked to the orbital lab.But the Dec. 14 leak, which emptied the Soyuz of a vital fluid used to regulate crew cabin temperatures, has derailed Russia's space station routines, with engineers in Moscow examining whether to launch another Soyuz to retrieve the three-man team that flew to ISS aboard the crippled MS-22 craft."We have asked SpaceX a few questions on their capability to return additional crew members on Dragon if necessary, but that is not our prime focus at this time," NASA spokeswoman Sandra Jones said in a statement to Reuters.The station's four other crew members - two more from NASA, a third Russian cosmonaut and a Japanese astronaut - arrived in October via a NASA-contracted SpaceX Crew Dragon capsule, which also remains parked at the ISS.A hardware malfunction could raise additional questions for Roscosmos about the integrity of other Soyuz vehicles, such as the one it might send for the crew's rescue, said Mike Suffredini, who led NASA's ISS program for a decade until 2015."