Four astronauts are hoping that Friday is the day that they’ll get to head to the International Space Station.

They were all ready to go on Wednesday after putting on their spacesuits and boarding their SpaceX spacecraft atop a Falcon 9 rocket at NASA’s Kennedy Space Center in Florida. But with less than 45 minutes left in the countdown, SpaceX called off the launch. Mission controllers were unable to solve a hydraulic issue with a clamp arm that holds the rocket before it launches.

The weather along the launch path looked iffy on Thursday so Friday is the next chance for them to get off the ground.

Friday’s flight is a routine rotation of crew on the space station, but it is garnering extra attention because it will at last allow the return to Earth of Suni Williams and Butch Wilmore, two NASA astronauts whose brief scheduled visit to the space station last June was unexpectedly stretched to more than nine months (and at least two extra days after Wednesday’s scrubbed flight).

Here’s other information about the mission, which is named Crew-10 because it is the 10th such mission by SpaceX ferrying crew to and from the space station.

The four astronauts — two from NASA, one from Japan and one from Russia — are scheduled to launch at 7:03 p.m. Eastern time.

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