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.

President-elect Donald Trump is attending SpaceX’s launch of its Super Heavy Starship, a rocket Elon Musk deemed key for “multi-planetary” space travel, for its sixth test flight from Boca Chica, Texas,