SpaceX CEO Elon Musk took to X on Thursday night to explain what his company believes may have caused part of the Starship rocket to experience a "rapid unscheduled disassembly."

SpaceX's seventh Starship test flight will now launch no earlier than Thursday, Jan. 16, at 5 p.m. EST (2200 GMT).

After Jeff Bezos's Blue Origin nailed its first-ever orbital flight, Elon Musk's SpaceX is seizing back the spotlight on Thursday with the latest launch of Starship, the gargantuan next-generation rocket that could one day ferry humans to Mars.

The latest test of Space X's giant Starship rocket has failed, minutes after launch. Officials at Elon Musk's company said the upper stage was lost after problems developed after lift-off from Texas on Thursday. But the Super Heavy booster managed to return to its launchpad as planned, prompting an eruption of applause from ground control teams.

Despite the spectacular failure, Elon Musk appeared to see the bright side, posting: "Success is uncertain, but entertainment is guaranteed!"

Bezos' New Glenn and Musk's Starship both are heading for launch, and both could lift off in close timing to each other. Here's what we know.

Blue Origin's New Glenn finally roared into orbit in the early hours of Thursday, with SpaceX's Starship rocket set to launch hours later.

The triumph was, however, short-lived when teams lost contact with the upper stage vehicle. SpaceX later confirmed it had undergone ‘rapid unscheduled disassembly,’ the company’s euphemism for an

SpaceX suspects a fire may have caused its Starship to break apart during liftoff and send trails of flaming debris near the Caribbean. SpaceX's Elon Musk said preliminary indications are that leaking fuel built up pressure in the cavity above the engine firewall. The resulting fire would have doomed the spacecraft.

The Starship's booster was caught as planned between two giant mechanical arms at the launchpad - but disaster hit the rocket itself.

SpaceX is set to launch the seventh test flight of its Starship megarocket today (Jan. 15) at 5 p.m. EST (2200 GMT), and you can watch the action live.