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SpaceX Starship briefly becomes largest rocket in history – now what’s next?

For a brief moment on August 6th, Starship became the largest rocket in history. (SpaceX)

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4 years ago

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On August 6th, after a great deal of anticipation, SpaceX stacked a Starship on top of a Super Heavy booster for the first time ever, very briefly assembling the largest rocket in history.

However, barely an hour after the two stages were integrated and (presumably) latched together, SpaceX lifted Starship (S20) off the booster, returned it to its transport stand, and rolled the ship back to the build site later that day. Though an extreme sensitivity to wind conditions has delayed the procedure, Super Heavy Booster 4 (B4) also appears to be on track to be removed from the orbital launch mount and sent either back to the factory or to a suborbital launch mount that’s been modified for booster testing.

For those that followed the process closely in the days and weeks prior, the fact that Starship’s first full assembly was just a fit check (and, really, more like 50:50 between fit check and photo op) came as no surprise. In the lead-up, it became clear through several reports that CEO Elon Musk had challenged SpaceX to stack Ship 20 and Booster 4 by August 5th and flown in several hundred employees normally stationed elsewhere to accomplish the feat.

Ignoring weather delays that prevented stacking on August 5th, SpaceX met Musk’s challenge in all but the literal sense, assembling the world’s largest rocket into one integrated stack for the first time ever. Even more significantly, despite the fact that SpaceX could have easily decided to stack two not-for-flight prototypes to sort of achieve the same feat, both stages – Ship 20 and Booster 4 – involved in the August 6th milestone are nominally destined for flight.

Barring surprises, the same exact pair is scheduled to support Starship’s first orbital test flight as early as this year. Before they can be cleared for flight, however, a great deal of work must still be completed – work that in some cases is unprecedented in the history of the Starship program.

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Not long after the stacking milestone, Musk himself sketched out a few of the tasks still in front of the rocket. Namely, Musk says that SpaceX must still complete Starship S20’s partially-finished heat shield, install some form of heat shield(s) to protect Super Heavy Booster 4’s 29 naked Raptor engines; finish installing, plumbing, and activating 4-7 massive custom propellant storage tanks; and assemble, install, and activate a giant mechanical umbilical arm on the launch tower to fuel and power Starship.

All are undoubtedly crucial and Starship is unlikely to launch before any of them are more or less complete. However, the booster and ship themselves are arguably far more of a pressure point. Before they can be deemed ready for flight, both the ship and booster must complete unprecedented test campaigns on the ground.

Ship 20 will need to complete cryogenic proof testing to verify that the first Starship with six Raptor engine mounts is structurally sound. SpaceX has already modified one of its two suborbital Starship launch mounts for that purpose. Once cryo proof and hydraulic ram testing is complete, those six rams will likely be removed and six Raptor engines will be installed in their place, potentially setting up Ship 20 to become the first Starship prototype to static fire six engines – and any number of Raptor Vacuum engines.

Super Heavy Booster 4 will be faced with an even more ambitious static fire test campaign as SpaceX likely gradually installs more and more engines. Depending on how focused SpaceX is on speed over thoroughness, that process could involve gradually adding 2-5 engines after every static fire or could result in SpaceX starting with 4-9 engines and then immediately jumping from 9 to a full 29-Raptor static fire.

Only after completing those crucial qualification tests is SpaceX likely to stack Ship 20 and Booster 4 for a second time and enter the first true full-stack Starship launch flow – hopefully culminating in the first orbital launch attempt later this year, but only as soon as the FAA completes an environmental review and approves the rocket’s launch license. Technically, FAA approval could come next month or it could take the agency a year or more – it’s almost impossible to predict without official information. However, given SpaceX’s track record with Starship prototypes and Booster B3, it’s likely that a flightworthy Starship and Super Heavy will be stacked on the pad and ready to launch just a few months from now.

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Stay tuned for updates on that potential standoff in the making and Starship’s progress towards its first orbital test flight.

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Eric Ralph is Teslarati's senior spaceflight reporter and has been covering the industry in some capacity for almost half a decade, largely spurred in 2016 by a trip to Mexico to watch Elon Musk reveal SpaceX's plans for Mars in person. Aside from spreading interest and excitement about spaceflight far and wide, his primary goal is to cover humanity's ongoing efforts to expand beyond Earth to the Moon, Mars, and elsewhere.

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Elon Musk

Elon Musk maps out Tesla’s AI chip iterations, and they’re pretty nutty

Based on the CEO’s post, it appears that Tesla is already exploring generations as far as AI8.

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23 minutes ago

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November 3, 2025

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Elon Musk recently revealed new details about Tesla’s next-generation AI5 chip while hinting at even more advanced iterations of its custom silicon. 

Based on the CEO’s post, it appears that Tesla is already exploring generations as far ahead as AI8.

Elon Musk teases Tesla’s chip development

In his X post, Musk stated that he had just completed a design review with Tesla’s chip engineers in California and Texas for the company’s upcoming AI5 chip. This was not surprising at all, considering that Musk has been discussing AI5 for quite some time now. What was surprising, however, were his comments that followed.

“And AI6 and AI7 will follow in fast succession. AI8 will be out of this world,” he wrote in his post, adding in a follow-up that his chip design review would be continuing the next day, followed by an Optimus demo review.

Considering that Tesla is currently rolling out a Robotaxi service using cars that are equipped with AI4 chips, some industry watchers have expressed interest in why the company is developing several generations’ worth of silicon for the company’s products. Inasmuch as AI4 might be enough for FSD and the Robotaxi rollout today, however, products such as Optimus might benefit from a more advanced chip. 

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Even AI5 will already be insanely impressive

During Tesla’s Q3 2025 earnings call, Musk described AI5 as “an amazing design” that represents a full evolution from the AI4 chip currently used in its vehicles and data centers. The new hardware, which will be manufactured by both Samsung in Texas and TSMC in Arizona, is expected to deliver up to 40x performance gains compared to its predecessor.

Tesla’s in-house engineering team redesigned the chip from the ground up, removing traditional components such as GPUs and image signal processors to improve efficiency and power måanagement. Musk said the chip now fits within a half-reticle design, calling it “a beautiful chip” into which he’s “poured so much life energy.”

Musk confirmed Tesla’s plan to create an oversupply of AI5 chips that could power not only vehicles but also humanoid robots and data centers. He emphasized that Tesla’s vertically integrated approach, designing both hardware and software, gives it a unique edge in scaling AI applications.

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Elon Musk

Tesla to offer Full Self-Driving gifting program: here’s how it will work

Tesla executive Raj Jegannathan said the company would be shipping the gifting program out before the holidays, making a great gift for owners just in time for Christmas.

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5 hours ago

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November 2, 2025

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Credit: Tesla

Tesla will soon offer a gifting program for its Full Self-Driving (Supervised) suite, allowing people to gift a subscription to the semi-autonomous driving software for a variety of timeframes.

The idea would allow people to gift Full Self-Driving as a trial, potentially shifting them to subscribe or even buy the software outright if they find it useful.

Tesla is overhauling its Full Self-Driving subscription for easier access

FSD is a pretty difficult thing to not use once you have it, and while you still have to pay attention, and it has its shortcomings, it takes a lot of the stressors out of driving.

Tesla executive Raj Jegannathan said the company would be shipping the gifting program out before the holidays, making a great gift for owners just in time for Christmas.

Full Self-Driving is Tesla’s semi-autonomous driving platform that is currently among the most robust options on the market. As a personal user, I find it to be an extremely beneficial feature that I use on a daily basis.

While Tesla does offer gift cards, this would be a great option to choose the present you’re giving to a family member or friend.

Tesla offers a subscription to Full Self-Driving in the United States for $99 per month; it gives people an opportunity to try the suite for a month and is more affordable in the short term for those who cannot swing the current $8,000 fee to purchase it outright.

CEO Elon Musk has advised every Tesla owner to purchase the suite outright. In 2020, he confirmed that a subscription program would be released, but he said, “It will be economically better to have bought FSD.”

He continued in 2021, stating that “buying FSD will still be a better long-term deal than subscription.

He has also said that the monthly subscription price could rise as FSD goes to wide release, but that has yet to happen. In fact, it was originally $199 a month, but Tesla decreased the price to $99. We’re hopeful it doesn’t get more expensive.

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Elon Musk

Elon Musk just roasted Sam Altman’s Tesla Roadster cancellation

“And you forgot to mention act 4, where this issue was fixed and you received a refund within 24 hours.

But that is in your nature.”

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21 hours ago

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November 2, 2025

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Elon Musk has responded to OpenAI CEO Sam Altman’s decision to cancel his Tesla Roadster reservation, which he revealed on X on Thursday.

We reported on Altman’s decision, which he called “A tale in three acts,” showing his confirmation email from Tesla back in 2018, an email requesting his $50,000 deposit back after canceling his order, and a notification from Google that the email he sent was not delivered.

Musk did not take too kindly to the post from his tech rival, first referencing his position with OpenAI, and then confirming that Altman received his reservation deposit back within 24 hours:

OpenAI was started by Musk, Altman, and others back in 2015, and was geared toward being a non-profit company that would develop safe artificial intelligence that would be accessible to people.

However, Musk and Altman did not agree on the future of the company. Musk left, and Altman turned OpenAI into a for-profit company. This led to a variety of lawsuits and some very public spats between the two. Musk has called out Altman for turning the company into a for-profit, which has been his main source of criticism for his former colleague.

The Roadster has been hanging in the balance of Tesla’s manufacturing plans for seven years, but the company has made more indications that it will be unveiled later this year and will have some insane technologies.

Musk said on Friday in an episode of the Joe Rogan Experience Podcast that Tesla is “getting close to demonstrating the prototype.”

He said:

“Whether it’s good or bad, it will be unforgettable. My friend Peter Thiel once reflected that the future was supposed to have flying cars, but we don’t have flying cars. I think if Peter wants a flying car, he should be able to buy one…I think it has a shot at being the most memorable product unveil ever. [It will be unveiled] hopefully before the end of the year. You know, we need to make sure that it works. This is some crazy technology in this car. Let’s just put it this way: if you took all the James Bond cars and combined them, it’s crazier than that.”

Musk hinted that the vehicle could fly and would have “crazy technology” that would put James Bond’s vehicles to shame. It will be interesting to see what Tesla will unveil when the event happens and if it can come through on this mind-blowing teaser.

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