SpaceX launched 46 more Starlink satellites into orbit from California on Friday.

The satellites were carried aboard a Falcon 9 rocket that blasted off from Vandenberg Space Force Base at 10:39 a.m.

The satellites were to be deployed later from the rocket’s second stage to join the Starlink constellation, a space-based broadband internet system with hundreds of satellites in low Earth orbit.

The Falcon 9’s reusable first stage returned from space and successfully touched down on a seagoing landing platform in the Pacific Ocean. It was the stage’s fourth flight.

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The launch occurred 24 hours after an initial attempt was scrubbed seconds before liftoff when the flight computer detected a problem with the position of a valve in one of the rocket’s engines, according to the SpaceX launch webcast.