US space agency NASA and SpaceX on Tuesday pushed back by 24 hours the launch of a Falcon 9 rocket that is to carry four astronauts to the International Space Station.
NASA's Stephen Bowen and Warren Hoburg, Russia's Andrey Fedyaev and Sultan al-Neyadi of the United Arab Emirates had been scheduled to blast off for the ISS at 2:07 am (0707 GMT) Sunday.
Liftoff of the SpaceX Dragon Crew-6 from the Kennedy Space Center in Florida has now been rescheduled for 1:45 am Monday, NASA officials said.
The four astronauts are scheduled to spend six months on the orbiting space station. They arrived in Florida on Tuesday to begin their final preparations for the mission.
"When we looked at the work remaining to go, primarily on the vehicle, getting Dragon and Falcon 9 ready to go, we were a little bit behind," said Steve Stich, manager of NASA's commercial crew program.
"And so we need a little bit more time," said Stich, speaking to reporters after the agency and SpaceX completed what is known as a flight readiness review of the Falcon 9 rocket and Dragon crew capsule.
Stich said several issues needed to be addressed including additional analysis concerning the thermal performance of some of the pods that cover the exterior of the Dragon spacecraft.
NASA officials said they expect the members of SpaceX Dragon Crew-6 to have a five-day handover with the four members of Dragon Crew-5, who have been on the ISS since October.
- Extended stay for Soyuz crew -
Also currently aboard the ISS are three astronauts whose return vehicle, a Soyuz MS-22 crew capsule, was damaged while docked with the ISS.
Russia's space agency Roscosmos said Tuesday that the trio -- Russian cosmonauts Dmitry Petelin and Sergei Prokopyev and NASA astronaut Frank Rubio
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