Saddled between steep NASA certification requirements for propulsive capsule landings and a rethink of related technology for Mars expeditions, SpaceX is shelving plans for upcoming Dragon 2 crew and cargo retrorocket returns to Earth. “That was a tough decision,” company founder and CEO Elon Musk said during last week’s International Space Station (ISS) Research and Development Conference in Washington. “Dragon 2 is capable of landing propulsively . . .  ...

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