SpaceX to launch Super Heavy-Starship today in 6th test flight. Here's what to know.

With President-elect Donald Trump and SpaceX CEO/newly-minted efficiency czar Elon Musk expected to be looking on, SpaceX plans to launch the world's most powerful rocket today on its sixth test flight — a ground-shaking sub-orbital launch of a gargantuan Super Heavy-Starship to evaluate critical upgrades.

Liftoff of the 30-foot-wide, 397-foot-tall rocket from Musk's sprawling Boca Chica, Texas, manufacturing and test facility on the Gulf Coast near Brownsville is targeted for 5 p.m. EST, the opening of a 30-minute launch window.