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> “This is not anything against SpaceX — they have done incredible things,” said Douglas Loverro, who served as the head of NASA’s human spaceflight division early in Mr. Trump’s first term. “But the further you move from known technology, the longer it takes to go ahead and get something done.”

> Landing such a tall rocket — Starship moon lander will be about 165 feet, compared with the Apollo Lunar lander that was 23 feet tall — means it can carry much more cargo, but it creates greater risk that Starship could topple once it arrives on the moon, Mr. Loverro said.