A SpaceX Starship upper stage exploded during ramp-up to an expected engine test firing at the company's Starbase facility on the Texas Gulf Coast. It's an apparent major setback for the program.

Dozens of startups working on data centers, mining and pharmaceuticals are hanging on Elon Musk's long-stalled megarocket.

SpaceX's Starship splashed down in the Indian Ocean about an hour after launch. A camera on buoy captured the fireworks.