Spacex and NASA have rescheduled a launch until this Friday

SpaceX will attempt a 3:25 p.m. Friday launch from Cape Canaveral of cargo to the International Space Station, the company and NASA confirmed this morning.

The weather forecast is challenging, with a 40 percent chance of conditions that would allow a Falcon 9 rocket to blast off with a Dragon capsule carrying nearly 5,000 pounds of cargo.

SpaceX today blamed the scrub of Monday’s first launch attempt on a helium valve in the Falcon 9 rocket’s pneumatic stage separation system.

The valve was not holding the right pressure, meaning the system would have relied on a backup valve

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