SpaceX fired up a Super Heavy booster on the launch pad today (Aug. 9) for the first time ever, notching a big milestone in the development of its Starship deep-space transportation system.

The Super Heavy in question, a prototype known as Booster 7, is scheduled to launch on the Starship program’s first orbital test flight in the coming months. SpaceX is gearing up for that mission, as today’s engine test shows.

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