SpaceX's latest Starship Super Heavy booster just breathed fire for the second time.
The Starship first-stage prototype, known as Booster 9, performed its second "static fire" test today (Aug. 25) at 1:38 p.m. EDT (1638 GMT), briefly igniting its Raptor engines while sitting atop the orbital launch mount at SpaceX's Starbase site in South Texas.
The engines burned for about six seconds, just as planned, SpaceX representatives said during a webcast of today's test.
This was the second such test for Booster 9; the huge vehicle lit up 29 of its 33 Raptors during an Aug. 6 static fire. Today, all 33 ignited.
"Super Heavy Booster 9 static fire successfully lit all 33 Raptor engines, with all but two running for the full duration. Congratulations to the SpaceX team on this exciting milestone!" SpaceX said in a post on X (formerly Twitter) this afternoon.
The two static fires are part of the preparations for the second-ever test flight of a fully stacked Starship. Booster 9 will fly on that mission, along with an upper-stage prototype called Ship 25.
The first Starship test launch, on April 20 of this year, aimed to send an upper stage partway around Earth, with splashdown targeted in the Pacific Ocean near Hawaii. But that didn't happen; the vehicle's two stages failed to separate as planned, and SpaceX sent a self-destruct command, destroying Starship high above the Gulf of Mexico.
For example, the company has shifted to a "hot staging" strategy, meaning that Starship's upper stage will now begin firing its six Raptor engines before fully separating from the Super Heavy booster. That change required adding a venting system and a heat shield to the top of Booster 9, which SpaceX did between the first and second static fires.
Musk wants Booster 9 and Ship 25 to launch soon, but the timeline is not entirely up to him: The U.S. Federal Aviation Administration (FAA), which issues launch licenses, is apparently still reviewing the mishap report that SpaceX filed about the first launch.
Editor's note: This story was updated at 5:25 p.m. ET on Aug. 25 with news that all 33 of Booster 9's Raptors fired during today's test.