SpaceX had earlier said that the rocket’s upper stage was being fuelled, suggesting the launch was on.
Musk himself had posted on X an hour earlier that “Starship 10 launching tonight”.
According to road closures nearby Starbase, the 10th Starship flight could still launch on tomorrow or Wednesday NZT but SpaceX did not offer a timeline.
The hour-long, uncrewed mission had been planned to put the upper stage through a series of trials as it flew halfway around the world before the lower stage booster splashed down in the Indian Ocean.
Starship is central to billionaire SpaceX founder Musk’s ambition of colonising Mars, while Nasa is counting on a modified version to return Americans to the Moon.
However, the rocket’s upper stage – which is the spacecraft intended to carry crew and cargo – has exploded in all three previous test flights in 2025.
Two of the failed tests sent debris raining down over Caribbean islands, while the other reached space before breaking up. Then in June, another upper stage exploded on the ground during a “static fire” test.
The 403ft (123m) rocket is designed to eventually be fully reusable, but the company has not yet managed to get the upper stage to deliver a payload to space or return to the launch site.
After an investigation into the previous failed flight in May, SpaceX said it would “intentionally stress the structural limits” of the upper stage, in the hopes of sounding out a successful return.
SpaceX has succeeded in catching the lower stage booster with giant “chopstick” launch tower arms three times, but the 10th flight is not planned to attempt the feat.
The company’s “fail fast, learn fast” ethos has long been credited with its remarkable track record, giving the US company a commanding global lead in launches thanks to its Falcon rocket family.
But the Starship setbacks have raised doubts over whether the company can repeat that success with easily the biggest rocket in history.
Dallas Kasaboski, a space analyst for consulting firm Analysys Mason, told AFP before the cancelled launch that the recent failures were beginning to take the sheen off SpaceX’s golden reputation.
“I think there is a lot of pressure on this mission,” he said.
“We’ve had so many tests and it hasn’t proven itself reliable – the successes have not exceeded the failures.”
Will Lockett, a former engineer turned commentator went further, arguing on his Substack newsletter that the rocket’s failure to deliver a payload to orbit yet suggested “the concept of Starship is fundamentally flawed”.
The world’s richest man has staked the company’s future on Starship, planning to eventually retire its current generation of rockets and spacecraft in favour of the new system.
Even if the 10th test eventually succeeds, formidable technical hurdles remain – from making the system fully and rapidly reusable at low cost to proving it can refuel super-cooled propellant in orbit, a prerequisite for deep-space missions.
Still, SpaceX is pressing ahead, increasing the frequency of launches despite criticism from environmental groups over ecological impacts.
The Federal Aviation Administration (FAA) said last week that it has closed its investigation into the last Starship explosion, saying that no one was harmed.
Musk – who is known for setting extremely ambitious timelines – has maintained that Starship will launch its first uncrewed missions to Mars next year.
-Agence France-Presse
