Arkadia Space's DARK propulsion system, using hydrogen peroxide propellant, was flown on a D-Orbit ION vehicle launched in March. Credit: Arkadia Space WASHINGTON — Spanish startup Arkadia Space has ...

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NASA’s first crewed moon mission in decades was delayed as its engineers grapple with an all-too-familiar rocket problem: hydrogen leaks. Fixing the issue is even trickier than it may seem.