Takeoff was slated for Wednesday evening from Kennedy Space Center in Florida, but the company called off the launch attempt because of an issue with the launchpad’s ground system. The problem stemmed from a hydraulics system used to control one of two clamps that hold on to the upper portion of the rocket as it sits vertically on the ground pad before launch.

Two NASA astronauts who have been in space for more than nine months awaiting a return trip to Earth are finally set to come home. Suni Williams and Butch Wilmore — who have been aboard the International Space Station since last June last year — are due to undock with the SpaceX Crew-9 on March 16,

On board the Crew-10 mission are NASA astronauts Anne McClain and Nichole Ayers, JAXA (Japan Aerospace Exploration Agency) astronaut Takuya Onishi, and Roscosmos cosmonaut Kirill Peskov.