SpaceX’s launch of the world’s biggest and most powerful rocket system has been postponed after it experienced a glitch minutes before take-off.

A pressurant valve on the Starship rocket was found to be frozen, said SpaceX chief Elon Musk.

Another launch will take place “in a few days” according to the tech giant, who said he “learned a lot” from today’s test.

The California-based space company announced in a live stream during the final minutes of the countdown that it was calling off the flight attempt for at least 48 hours.

The Federal Aviation Administration (FAA) had issued SpaceX with a licence to put its most powerful rocket system through its paces, saying it met all safety and environmental requirements.

Musk set low expectations on Sunday night.

“Success is not what should be expected,” he told a private Twitter audience, saying the best-case scenario would provide crucial data about how the vehicle ascends to space and how it will fly back to Earth.

“Probably tomorrow will not be successful. It’s just a very fundamentally difficult thing.”

Sitting atop a huge Super Heavy booster for a combined height of 120m, Starship is the world’s biggest and most powerful rocket system. It was first unveiled in 2019.

Once up and running, it will be used for taking satellites into orbit – and SpaceX founder Musk has said it will eventually carry astronauts to the moon and even Mars.

The billionaire said any launch this week only has a 50% chance of success, but thinks there’s an 80% chance of reaching orbit by the end of the year.

The Super Heavy booster, which has 33 rocket engines, had a stationary launch test back in February, and generated enough power to reach orbit.

How will the first orbital test work?

Starship would be carried skyward by a Super Heavy prototype called Booster 7 from a launch pad in Brownsville.

The rocket system’s second stage – the craft that would carry a crew of astronauts in the future – would then be deployed and complete a full orbit of the Earth, before re-entering the atmosphere and splashing into the Pacific.

Meanwhile, the first stage would be discarded in the Gulf of Mexico.

No landings will be attempted in the debut test flight, and no satellites or people will be on board.

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Ahead of the planned launch on Monday, a notice posted by the FAA suggested Tuesday and Wednesday as backup dates.

The licence issued by the US flight regulator lasts five years, by which time NASA hopes to have used Starship to transport astronauts to the lunar surface for the first time in more than 50 years via its Artemis programme.

The privately-funded Moon mission is also aiming to take a crew to the moon and back aboard Starship.

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