The crew onboard were already buckled into their flight capsule when an engineering issue was identified by ground staff in Florida.

A launch pad problem has forced a flight delay to replace NASA's two stuck astronauts. The new crew needs to get to the International Space Station before Butch Wilmore and Suni Williams can head home after nine months in orbit.

A planned SpaceX mission that was set to launch on Wednesday has been postponed due to a hydraulic issue with the launch tower at Kennedy Space Center in Florida. The mission, part of NASA’s Commercial Crew Program,