Launch had been planned for early February, but it was delayed to repair a hydrogen leak and, more recently, to give engineers time to fix a helium pressurization problem in the rocket's upper stage. Launch is now on hold until at least April 1.
Their SpaceX capsule made a fast and fiery re-entry through the Earth's atmosphere, before four parachutes opened to take them to a gentle splashdown off the coast of Florida.
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