With President-elect Donald Trump and newly-minted efficiency czar Elon Musk looking on, SpaceX launched the world's most powerful rocket on its sixth test flight Tuesday, an up-and-down trip to space by a gargantuan Super Heavy-Starship to evaluate a variety of safety and performance upgrades.

SpaceX has launched another Starship rocket, but passed up catching it with giant mechanical arms SpaceX on Tuesday launched another Starship rocket, but passed up catching the booster with giant mechanical arms. Unlike last month’s success, the booster ...