Starship — the huge spacecraft that Elon Musk says will one day take people to Mars — failed during its latest test flight on Thursday when its upper stage exploded in space, raining debris and disrupting air traffic at airports from Florida to Pennsylvania.

It was the second consecutive test flight of the most powerful rocket ever built where the upper-stage spacecraft malfunctioned. It started spinning out of control after several engines went out and then lost contact with mission control.

Photographs and videos posted on the social media site X by users saying they were along the Florida coast showed the spacecraft breaking up. The falling debris disrupted flights at airports in Miami, Orlando, Palm Beach and Fort Lauderdale, and as far away as Philadelphia International Airport.

The Starship rocket system is the largest ever built. At 403 feet tall, it is nearly 100 feet taller than the Statue of Liberty atop its pedestal.

It has the most engines ever in a rocket booster: The Super Heavy booster is powered by 33 of SpaceX’s Raptor engines. As those engines lift Starship off the launchpad, they will generate 16 million pounds of thrust at full throttle.

The upper part, also called Starship or Ship for short, looks like a shiny rocket from science fiction movies of the 1950s, is made of stainless steel with large fins. This is the upper stage that will head toward orbit, and ultimately could carry people to the moon or even Mars.

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