SpaceX called off a test flight of its powerful Starship rocket and Super Heavy booster as the countdown clock reached zero Thursday at the company's spaceport in South Texas.

The launch team at Starbase, Texas, just north of the US-Mexico border, aimed to launch the more than 400-foot-tall rocket at 5:45 pm local time (6:45 pm EDT; 22:45 UTC). The countdown proceeded smoothly throughout the day, culminating in the loading of more than 11.5 million pounds of liquid methane and liquid oxygen into the two-stage rocket.

But the computers controlling the countdown called an abort during the Super Heavy booster's engine startup sequence. SpaceX scrubbed the launch attempt, and engineers began preparations to drain the rocket's propellant tanks. Officials did not immediately announce when they plan to try to launch again.

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The next test flight of SpaceX's Starship spacecraft and Super Heavy booster could take off as soon as Thursday, and much of the hour-long mission will look a lot like the last Starship flight in May.

But there are a few key differences for this launch, set to occur during a launch window that opens at 5:45 pm CDT (22:45 UTC) on Thursday. The most notable change is the inclusion of real, functioning Starlink satellites inside Starship's cargo bay. SpaceX previously tested the ship's payload deployment mechanism using simulators mimicking the mass and dimensions of the company's next-generation Starlink Version 3 broadband satellites.

This time—Starship's 13th full-scale test flight and the second to use SpaceX's newest version of Starship—technicians have installed 20 Starlink V3 satellites into the ship's deployer, a system of pulleys and cables designed to eject a stack of satellites one at a time through an opening on the side of the spacecraft. The satellites will not be part of SpaceX's operational network, but engineers will attempt to briefly establish laser communication links between the Starlink V3s and other spacecraft flying in low-Earth orbit. If successful, these links will validate Starlink V3's interoperability with SpaceX's previous generation of Starlink satellites.

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