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.
Here's how a protection test works. The microcode feeds three things to the Test PLA:
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But the Cabinet Office said it was committed to the inquiry and learning the lessons for the future.
Some say the technology is devaluing their work, while others reckon it is not yet – and might never be – good enough to replace them entirely