SpaceX stacks Super Heavy booster ahead of Starship megarocket's 12th test flight

a tall silver rocket upright in a hangar
SpaceX's Super Heavy booster for Starship Flight 12 standing in a high bay at the company's Starbase facility in South Texas. (Image credit: SpaceX via X)

Just before the holidays, SpaceX took a big step toward the next test flight of its Starship megarocket.

On Christmas Eve (Dec. 24), the company posted a photo on X of the shiny Super Heavy booster that will conduct Starship Flight 12 standing in a high bay at its Starbase facility in South Texas. "Stacking complete," the photo's caption reads.

That represents a bit of a delay, because the Super Heavy booster that was originally slated for Flight 12 buckled during testing in late November and SpaceX had to get another vehicle ready.

Starship is the biggest and most powerful rocket ever built, standing more than 400 feet (122 meters) tall when fully stacked. It consists of two fully reusable elements — Super Heavy and a 171-foot-tall (52 m) upper stage known as Starship, or simply Ship.

Starship flew five times last year. The giant rocket suffered problems on the first three of those suborbital test launches, but the last two, which launched in August and October, went entirely according to plan.

Starship Die Cast Rocket Model Now $47.99 on Amazon.
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If you can't see SpaceX's Starship in person, you can score a model of your own. Standing at 13.77 inches (35 cm), this is a 1:375 ratio of SpaceX's Starship as a desktop model. The materials here are alloy steel and it weighs just 225g.

Flight 12 will try to extend that run of success while also breaking in the new "Version 3" of Starship. Among other modifications, this variant is a bit taller than its predecessors and will also be the first to employ SpaceX's new Raptor 3 engine.

Starship Version 3 is the first iteration of the vehicle capable of flying to Mars, SpaceX has said. And that could happen sooner than you think: Company founder and CEO Elon Musk has said he'd like to launch a few uncrewed Starships to the Red Planet during the next opportunity, which comes in the last few months of this year. (The two planets align for efficient interplanetary travel just once every 26 months.)

Starship must tick some big boxes before making that giant leap, however. For example, the vehicle still needs to reach Earth orbit and master in-space refueling.

Mike Wall
Senior Space Writer

Michael Wall is a Senior Space Writer with Space.com and joined the team in 2010. He primarily covers exoplanets, spaceflight and military space, but has been known to dabble in the space art beat. His book about the search for alien life, "Out There," was published on Nov. 13, 2018. Before becoming a science writer, Michael worked as a herpetologist and wildlife biologist. He has a Ph.D. in evolutionary biology from the University of Sydney, Australia, a bachelor's degree from the University of Arizona, and a graduate certificate in science writing from the University of California, Santa Cruz. To find out what his latest project is, you can follow Michael on Twitter.

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